1. Energinet.dk. Technical report on the future expansion and undergrounding of the electricity transmission grid, Summary April 2008. Available from: http://www.energinet.dk.
2. Modeling of hybrid renewable energy systems;Deshmukh;Renewable and Sustainable Energy Reviews,2008
3. A review of solar thermal technologies;Thirugnanasambandam;Renewable and Sustainable Energy Reviews,2010
4. International Energy Agency (IEA). IEA PVPS, Trends in photovoltaic applications, Survey report of selected IEA countries between 1992 and 2008, IEA 2009.
5. Grid-connected photovoltaic power systems: technical and potential problems-a review;Eltawil;Renewable and Sustainable Energy Reviews,2010