Table of Contents 1 Report Overview 1.1 Research Scope 1.2 Major Manufacturers Covered in This Report 1.3 Market Segment by Type 1.3.1 Global Substation Wide Area Monitoring System Market Size Growth Rate by Type (2019-2025) 1.3.2 Phasor Measurement Units (PMUs) 1.3.3 Phasor Data Concentrators (PDCs) 1.3.4 Communication Networks 1.3.5 PDC Solutions 1.4 Market Segment by Application 1.4.1 Global Substation Wide Area Monitoring System Market Share by Application (2019-2025) 1.4.2 Transmission Substation 1.4.3 Distribution Substation 1.4.4 Collector Substation 1.4.5 Converter Substations 1.4.6 Switching Station 1.5 Study Objectives 1.6 Years Considered 2 Global Growth Trends 2.1 Production and Capacity Analysis 2.1.1 Global Substation Wide Area Monitoring System Production Value 2014-2025 2.1.2 Global Substation Wide Area Monitoring System Production 2014-2025 2.1.3 Global Substation Wide Area Monitoring System Capacity 2014-2025 2.1.4 Global Substation Wide Area Monitoring System Marketing Pricing and Trends 2.2 Key Producers Growth Rate (CAGR) 2019-2025 2.2.1 Global Substation Wide Area Monitoring System Market Size CAGR of Key Regions 2.2.2 Global Substation Wide Area Monitoring System Market Share of Key Regions 2.3 Industry Trends 2.3.1 Market Top Trends 2.3.2 Market Drivers 3 Market Share by Manufacturers 3.1 Capacity and Production by Manufacturers 3.1.1 Global Substation Wide Area Monitoring System Capacity by Manufacturers 3.1.2 Global Substation Wide Area Monitoring System Production by Manufacturers 3.2 Revenue by Manufacturers 3.2.1 Substation Wide Area Monitoring System Revenue by Manufacturers (2014-2019) 3.2.2 Substation Wide Area Monitoring System Revenue Share by Manufacturers (2014-2019) 3.2.3 Global Substation Wide Area Monitoring System Market Concentration Ratio (CR5 and HHI) 3.3 Substation Wide Area Monitoring System Price by Manufacturers 3.4 Key Manufacturers Substation Wide Area Monitoring System Plants/Factories Distribution and Area Served 3.5 Date of Key Manufacturers Enter into Substation Wide Area Monitoring System Market 3.6 Key Manufacturers Substation Wide Area Monitoring System Product Offered 3.7 Mergers & Acquisitions, Expansion Plans 4 Market Size by Type 4.1 Production and Production Value for Each Type 4.1.1 Phasor Measurement Units (PMUs) Production and Production Value (2014-2019) 4.1.2 Phasor Data Concentrators (PDCs) Production and Production Value (2014-2019) 4.1.3 Communication Networks Production and Production Value (2014-2019) 4.1.4 PDC Solutions Production and Production Value (2014-2019) 4.2 Global Substation Wide Area Monitoring System Production Market Share by Type 4.3 Global Substation Wide Area Monitoring System Production Value Market Share by Type 4.4 Substation Wide Area Monitoring System Ex-factory Price by Type 5 Market Size by Application 5.1 Overview 5.2 Global Substation Wide Area Monitoring System Consumption by Application 6 Production by Regions 6.1 Global Substation Wide Area Monitoring System Production (History Data) by Regions 2014-2019 6.2 Global Substation Wide Area Monitoring System Production Value (History Data) by Regions 6.3 United States 6.3.1 United States Substation Wide Area Monitoring System Production Growth Rate 2014-2019 6.3.2 United States Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 6.3.3 Key Players in United States 6.3.4 United States Substation Wide Area Monitoring System Import & Export 6.4 European Union 6.4.1 European Union Substation Wide Area Monitoring System Production Growth Rate 2014-2019 6.4.2 European Union Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 6.4.3 Key Players in European Union 6.4.4 European Union Substation Wide Area Monitoring System Import & Export 6.5 China 6.5.1 China Substation Wide Area Monitoring System Production Growth Rate 2014-2019 6.5.2 China Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 6.5.3 Key Players in China 6.5.4 China Substation Wide Area Monitoring System Import & Export 6.6 Rest of World 6.6.1 Japan 6.6.2 Korea 6.6.3 India 6.6.4 Southeast Asia 7 Substation Wide Area Monitoring System Consumption by Regions 7.1 Global Substation Wide Area Monitoring System Consumption (History Data) by Regions 7.2 United States 7.2.1 United States Substation Wide Area Monitoring System Consumption by Type 7.2.2 United States Substation Wide Area Monitoring System Consumption by Application 7.3 European Union 7.3.1 European Union Substation Wide Area Monitoring System Consumption by Type 7.3.2 European Union Substation Wide Area Monitoring System Consumption by Application 7.4 China 7.4.1 China Substation Wide Area Monitoring System Consumption by Type 7.4.2 China Substation Wide Area Monitoring System Consumption by Application 7.5 Rest of World 7.5.1 Rest of World Substation Wide Area Monitoring System Consumption by Type 7.5.2 Rest of World Substation Wide Area Monitoring System Consumption by Application 7.5.1 Japan 7.5.2 Korea 7.5.3 India 7.5.4 Southeast Asia 8 Company Profiles 8.1 ABB 8.1.1 ABB Company Details 8.1.2 Company Description and Business Overview 8.1.3 Production and Revenue of Substation Wide Area Monitoring System 8.1.4 Substation Wide Area Monitoring System Product Introduction 8.1.5 ABB Recent Development 8.2 Electric Power Group 8.2.1 Electric Power Group Company Details 8.2.2 Company Description and Business Overview 8.2.3 Production and Revenue of Substation Wide Area Monitoring System 8.2.4 Substation Wide Area Monitoring System Product Introduction 8.2.5 Electric Power Group Recent Development 8.3 General Electric 8.3.1 General Electric Company Details 8.3.2 Company Description and Business Overview 8.3.3 Production and Revenue of Substation Wide Area Monitoring System 8.3.4 Substation Wide Area Monitoring System Product Introduction 8.3.5 General Electric Recent Development 8.4 Schneider Electric 8.4.1 Schneider Electric Company Details 8.4.2 Company Description and Business Overview 8.4.3 Production and Revenue of Substation Wide Area Monitoring System 8.4.4 Substation Wide Area Monitoring System Product Introduction 8.4.5 Schneider Electric Recent Development 8.5 Siemens 8.5.1 Siemens Company Details 8.5.2 Company Description and Business Overview 8.5.3 Production and Revenue of Substation Wide Area Monitoring System 8.5.4 Substation Wide Area Monitoring System Product Introduction 8.5.5 Siemens Recent Development 9 Market Forecast 9.1 Global Market Size Forecast 9.1.1 Global Substation Wide Area Monitoring System Capacity, Production Forecast 2019-2025 9.1.2 Global Substation Wide Area Monitoring System Production Value Forecast 2019-2025 9.2 Market Forecast by Regions 9.2.1 Global Substation Wide Area Monitoring System Production and Value Forecast by Regions 2019-2025 9.2.2 Global Substation Wide Area Monitoring System Consumption Forecast by Regions 2019-2025 9.3 United States 9.3.1 Production and Value Forecast in United States 9.3.2 Consumption Forecast in United States 9.4 European Union 9.4.1 Production and Value Forecast in European Union 9.4.2 Consumption Forecast in European Union 9.5 China 9.5.1 Production and Value Forecast in China 9.5.2 Consumption Forecast in China 9.6 Rest of World 9.6.1 Japan 9.6.2 Korea 9.6.3 India 9.6.4 Southeast Asia 9.7 Forecast by Type 9.7.1 Global Substation Wide Area Monitoring System Production Forecast by Type 9.7.2 Global Substation Wide Area Monitoring System Production Value Forecast by Type 9.8 Consumption Forecast by Application 10 Value Chain and Sales Channels Analysis 10.1 Value Chain Analysis 10.2 Sales Channels Analysis 10.2.1 Substation Wide Area Monitoring System Sales Channels 10.2.2 Substation Wide Area Monitoring System Distributors 10.3 Substation Wide Area Monitoring System Customers 11 Opportunities & Challenges, Threat and Affecting Factors 11.1 Market Opportunities 11.2 Market Challenges 11.3 Porter's Five Forces Analysis 12 Key Findings 13 Appendix 13.1 Research Methodology 13.1.1 Methodology/Research Approach 13.1.1.1 Research Programs/Design 13.1.1.2 Market Size Estimation 13.1.1.3 Market Breakdown and Data Triangulation 13.1.2 Data Source 13.1.2.1 Secondary Sources 13.1.2.2 Primary Sources 13.2 Author Details 13.3 Disclaimer

List of Tables and Figures Figure Substation Wide Area Monitoring System Product Picture Table Substation Wide Area Monitoring System Key Market Segments Table Major Manufacturers Substation Wide Area Monitoring System Covered in This Report Table Global Substation Wide Area Monitoring System Market Size Growth Rate by Type 2019-2025 (K Units) & (Million US$) Figure Global Substation Wide Area Monitoring System Sales Market Shar by Type 2014-2025 Figure Phasor Measurement Units (PMUs) Figures Table Major Manufacturers of Phasor Measurement Units (PMUs) Figure Phasor Data Concentrators (PDCs) Figures Table Major Manufacturers of Phasor Data Concentrators (PDCs) Figure Communication Networks Figures Table Major Manufacturers of Communication Networks Figure PDC Solutions Figures Table Major Manufacturers of PDC Solutions Table Global Substation Wide Area Monitoring System Market Share by Application 2019-2025 (K Units) Figure Transmission Substation Use Case Figure Distribution Substation Use Case Figure Collector Substation Use Case Figure Converter Substations Use Case Figure Switching Station Use Case Figure Substation Wide Area Monitoring System Report Years Considered Figure Global Substation Wide Area Monitoring System Production Value Growth Rate 2014-2025 (Million US$) Figure Global Substation Wide Area Monitoring System Production 2014-2025 (K Units) Figure Global Substation Wide Area Monitoring System Capacity 2014-2025 (K Units) Table Key Manufacturers Substation Wide Area Monitoring System Capacity (K Units) Figure Global Substation Wide Area Monitoring System Price 2014-2025 (USD/Unit) Table Global Substation Wide Area Monitoring System Market Size of Key Regions (Million USD) & (K Units) Table Global Substation Wide Area Monitoring System Growth Rate of Key Regions 2019-2025 (Million USD) Table Global Substation Wide Area Monitoring System Market Share for of Regions 2019-2025 (K Units) Table Market Top Trends Table Global Substation Wide Area Monitoring System Capacity by Manufacturers (2014-2019) (K Units) Table Global Substation Wide Area Monitoring System Capacity Market Share by Manufacturers (2014-2019) Table Global Substation Wide Area Monitoring System Production by Manufacturers (2014-2019) (K Units) Table Global Substation Wide Area Monitoring System Production Share by Manufacturers (2014-2019) Figure Global Substation Wide Area Monitoring System Production Share by Manufacturers in 2018 Table Substation Wide Area Monitoring System Revenue by Manufacturers (2014-2019) (Million USD) Table Substation Wide Area Monitoring System Revenue Share by Manufacturers (2014-2019) Figure Substation Wide Area Monitoring System Value Share by Manufacturers in 2018 Table Global Substation Wide Area Monitoring System Manufacturers Market Concentration Ratio (CR5 and HHI) Table Substation Wide Area Monitoring System Price by Manufacturers 2014-2019 (USD/Unit) Table Key Manufacturers Substation Wide Area Monitoring System Plants/Factories Distribution Table Key Manufacturers Substation Wide Area Monitoring System Area Served Table Date of Key Manufacturers Enter into Substation Wide Area Monitoring System Market Table Key Manufacturers Substation Wide Area Monitoring System Product Type Table Mergers & Acquisitions, Expansion Plans Table Global Phasor Measurement Units (PMUs) Production and Production Value (2014-2019) (K Units) & (Million US$) Table Global Phasor Data Concentrators (PDCs) Production and Production Value (2014-2019) (K Units) & (Million US$) Table Global Communication Networks Production and Production Value (2014-2019) (K Units) & (Million US$) Table Global PDC Solutions Production and Production Value (2014-2019) (K Units) & (Million US$) Table Global Substation Wide Area Monitoring System Production by Type (2014-2019) (K Units) Table Global Substation Wide Area Monitoring System Production Share by Type (2014-2019) Figure Global Substation Wide Area Monitoring System Production Market Share by Type (2014-2019) Figure Global Substation Wide Area Monitoring System Production Market Share by Type in 2018 Table Global Substation Wide Area Monitoring System Production Value by Type (2014-2019) (Million US$) Table Global Substation Wide Area Monitoring System Production Value Share by Type (2014-2019) Figure Global Substation Wide Area Monitoring System Production Value Market Share by Type (2014-2019) Figure Global Substation Wide Area Monitoring System Production Value Market Share by Type in 2018 Table Substation Wide Area Monitoring System Ex-factory Price by Type 2014-2019 (USD/Unit) Table Global Substation Wide Area Monitoring System Consumption by Application (2014-2019) (K Units) Table Global Substation Wide Area Monitoring System Consumption Share by Application (2014-2019) Figure Global Consumption Substation Wide Area Monitoring System Market Share by Application (2014-2019) Table Global Substation Wide Area Monitoring System Production by Regions 2014-2019 (K Units) Table Global Substation Wide Area Monitoring System Production Market Share by Regions 2014-2019 Figure Global Substation Wide Area Monitoring System Production Market Share by Regions 2014-2019 Figure Global Substation Wide Area Monitoring System Production Market Share by Regions in 2018 Table Global Substation Wide Area Monitoring System Production Value by Regions 2014-2019 (Million USD) Table Global Substation Wide Area Monitoring System Production Value Market Share by Regions 2014-2019 Figure Global Substation Wide Area Monitoring System Production Value Market Share by Regions 2014-2019 Figure Global Substation Wide Area Monitoring System Production Value Market Share by Regions in 2018 Table United States Substation Wide Area Monitoring System Production and Value 2014-2019 (K Units) & (Million USD) Figure United States Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure United States Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Table United States Substation Wide Area Monitoring System Import & Export (K Units) Table European Union Substation Wide Area Monitoring System Production and Value 2014-2019 (K Units) & (Million USD) Figure European Union Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure European Union Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Table European Union Substation Wide Area Monitoring System Import & Export (K Units) Table China Substation Wide Area Monitoring System Production and Value 2014-2019 (K Units) & (Million USD) Figure China Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure China Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Table China Substation Wide Area Monitoring System Import & Export (K Units) Figure Japan Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure Japan Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Figure Korea Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure Korea Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Figure India Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure India Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Figure Southeast Asia Substation Wide Area Monitoring System Production Growth Rate 2014-2019 (K Units) Figure Southeast Asia Substation Wide Area Monitoring System Production Value Growth Rate 2014-2019 (Million USD) Table Global Substation Wide Area Monitoring System Consumption by Regions 2014-2019 (K Units) Table Global Substation Wide Area Monitoring System Consumption Market Share by Regions 2014-2019 Figure Global Substation Wide Area Monitoring System Consumption Market Share by Regions 2014-2019 Figure Global Substation Wide Area Monitoring System Consumption Market Share by Regions in 2018 Figure United States Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Table United States Substation Wide Area Monitoring System Consumption by Type (2014-2019) (K Units) Figure United States Substation Wide Area Monitoring System Consumption Market Share by Type in 2019 Table United States Substation Wide Area Monitoring System Consumption by Application (2014-2019) (K Units) Figure United States Substation Wide Area Monitoring System Consumption Market Share by Application in 2019 Figure European Union Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Table European Union Substation Wide Area Monitoring System Consumption by Type (2014-2019) (K Units) Figure European Union Substation Wide Area Monitoring System Consumption Market Share by Type in 2019 Table European Union Substation Wide Area Monitoring System Consumption by Application (2014-2019) (K Units) Figure European Union Substation Wide Area Monitoring System Consumption Market Share by Application in 2019 Figure China Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Table China Substation Wide Area Monitoring System Consumption by Type (2014-2019) (K Units) Figure China Substation Wide Area Monitoring System Consumption Market Share by Type in 2019 Table China Substation Wide Area Monitoring System Consumption by Application (2014-2019) (K Units) Figure China Substation Wide Area Monitoring System Consumption Market Share by Application in 2019 Figure Rest of World Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Table Rest of World Substation Wide Area Monitoring System Consumption by Type (2014-2019) (K Units) Figure Rest of World Substation Wide Area Monitoring System Consumption Market Share by Type in 2019 Table Rest of World Substation Wide Area Monitoring System Consumption by Application (2014-2019) (K Units) Figure Rest of World Substation Wide Area Monitoring System Consumption Market Share by Application in 2019 Figure Japan Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Figure Korea Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Figure India Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Figure Southeast Asia Substation Wide Area Monitoring System Consumption Growth Rate (2014-2019) (K Units) Table ABB Company Details Table ABB Description and Business Overview Table ABB Substation Wide Area Monitoring System Production (K Units), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2014-2019) Table ABB Substation Wide Area Monitoring System Production Growth Rate (2014-2019) Table ABB Substation Wide Area Monitoring System Production Market Share in Global Market Table ABB Recent Development Table Electric Power Group Company Details Table Electric Power Group Description and Business Overview Table Electric Power Group Substation Wide Area Monitoring System Production (K Units), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2014-2019) Table Electric Power Group Substation Wide Area Monitoring System Production Growth Rate (2014-2019) Table Electric Power Group Substation Wide Area Monitoring System Production Market Share in Global Market Table Electric Power Group Recent Development Table General Electric Company Details Table General Electric Description and Business Overview Table General Electric Substation Wide Area Monitoring System Production (K Units), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2014-2019) Table General Electric Substation Wide Area Monitoring System Production Growth Rate (2014-2019) Table General Electric Substation Wide Area Monitoring System Production Market Share in Global Market Table General Electric Recent Development Table Schneider Electric Company Details Table Schneider Electric Description and Business Overview Table Schneider Electric Substation Wide Area Monitoring System Production (K Units), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2014-2019) Table Schneider Electric Substation Wide Area Monitoring System Production Growth Rate (2014-2019) Table Schneider Electric Substation Wide Area Monitoring System Production Market Share in Global Market Table Schneider Electric Recent Development Table Siemens Company Details Table Siemens Description and Business Overview Table Siemens Substation Wide Area Monitoring System Production (K Units), Revenue (Million US$), Price (USD/Unit) and Gross Margin (2014-2019) Table Siemens Substation Wide Area Monitoring System Production Growth Rate (2014-2019) Table Siemens Substation Wide Area Monitoring System Production Market Share in Global Market Table Siemens Recent Development Table Global Substation Wide Area Monitoring System Capacity, Production Forecast 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Capacity Forecast 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Production Forecast 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Production Value Forecast 2019-2025 (Million US$) Table Global Substation Wide Area Monitoring System Production Value Forecast 2019-2025 (Million US$) Table Global Substation Wide Area Monitoring System Production Forecast by Regions 2019-2025 (K Units) Table Global Substation Wide Area Monitoring System Production Market Share Forecast by Regions 2019-2025 Table Global Substation Wide Area Monitoring System Production Value Forecast by Regions 2019-2025 (Million US$) Table Global Substation Wide Area Monitoring System Consumption Forecast by Regions 2019-2025 (K Units) Table Global Substation Wide Area Monitoring System Consumption Market Share Forecast by Regions 2019-2025 Table United States Substation Wide Area Monitoring System Production and Production Value Forecast 2019-2025 (K Units) & (Million US$) Figure United States Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Table United States Substation Wide Area Monitoring System Production Value Forecast 2019-2025 (Million US$) Figure United States Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Table European Union Substation Wide Area Monitoring System Production and Production Value Forecast 2019-2025 (K Units) & (Million US$) Figure European Union Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Table European Union Substation Wide Area Monitoring System Production Value Forecast 2019-2025 (Million US$) Figure European Union Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Table China Substation Wide Area Monitoring System Production and Production Value Forecast 2019-2025 (K Units) & (Million US$) Figure China Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Table China Substation Wide Area Monitoring System Production Value Forecast 2019-2025 (Million US$) Figure China Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Figure Japan Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Figure Japan Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Figure Korea Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Figure Korea Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Figure India Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Figure India Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Figure Southeast Asia Substation Wide Area Monitoring System Production Growth Forecast 2019-2025 (K Units) Figure Southeast Asia Substation Wide Area Monitoring System Consumption Forecast 2019-2025 (K Units) Table Global Substation Wide Area Monitoring System Production Forecast by Type 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Production Forecast by Type 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Production Market Share Forecast by Type 2019-2025 Table Global Substation Wide Area Monitoring System Production Value Forecast by Type 2019-2025 (Million US$) Figure Global Substation Wide Area Monitoring System Production Value Forecast by Type 2019-2025 (Million US$) Figure Global Substation Wide Area Monitoring System Production Value Market Share Forecast by Type 2019-2025 Table Global Substation Wide Area Monitoring System Consumption Forecast by Application 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Consumption Forecast by Application 2019-2025 (K Units) Figure Global Substation Wide Area Monitoring System Consumption Market Share Forecast by Application 2019-2025 Figure Substation Wide Area Monitoring System Value Chain Table Substation Wide Area Monitoring System Distributors List Table Substation Wide Area Monitoring System Customers List Table Porter's Five Forces Analysis Table Research Programs/Design for This Report Figure Bottom-up and Top-down Approaches for This Report Figure Data Triangulation Table Key Data Information from Secondary Sources Table Key Data Information from Primary Sources