1. European Union, EU Energy markets in 2014, ISBN 978-92-79-37962-8
2. Eurostat - European Environment Agency, Energy, transport and environment indicators, 2016 ed., ISBN 978-92-79-60138-5
3. European Commission, Market Observatory For Energy, Europe’s Energy Position Annual Report 2010
4. Thermal and optical efficiency investigation of a parabolic trough collector;Tzivanidis;Case Studies Therm. Eng.,2015
5. ESTELA European Solar Thermal Electricity Association, Strategic research agenda 2020-2025, 2012.