1. Anderson, J., West, J., 2017. Global cloud cover. (accessed December 26, 2017).
2. North-east Asian super grid for 100% renewable energy supply: optimal mix of energy technologies for electricity, gas and heat supply options;Bogdanov;Energy Convers. Manage.,2016
3. Breyer, C., 2012. Economics of hybrid photovoltaic power plants. Pro Business ISBN: 978-3863863906.
4. Breyer, C., Schmid, J., 2010. Global distribution of optimal tilt angles for fixed tilted PV systems. In: 25th EU PVSEC/WCPEC-5. http://doi.org/10.4229/25thEUPVSEC2010-4BV.1.93.
5. Breyer, C., Schmid, J., 2010. Population density and area weighted solar irradiation: global overview on solar resource conditions for fixed tilted, 1-axis and 2-axes PV systems. In: 25th EU PVSEC/WCPEC-5. http://doi.org/10.4229/25thEUPVSEC2010-4BV.1.91.