1. I. Clover, pv-magazine (2015). http://www.pv-magazine.com/news/details/beitrag/buffett-strikes-cheapest-electricity-price-in-us-with-nevada-solar-farm_100020120/#axzz40eM9WRtt . Accessed 10 July 2015.
2. M.A. Green, K. Emery, Y. Hishikawa, W. Warta, and E.D. Dunlop, Prog. Photovolt. 23, 1 (2015).
3. W. Eric, Exclusive: First Solar’s CTO Discusses Record 18.6% Efficient Thin-Film Module (Greentech Media, 2015). http://www.greentechmedia.com/articles/read/Exclusive-First-Solars-CTO-Discusses-Record-18.6-Efficient-Thin-Film-Mod . Accessed 19 June 2015.
4. K. Mitchell, A.L. Fahrenbruch, and R.H. Bube, J. Appl. Phys. 829, 29 (2016).
5. D.T.F. Marple, Phys. Rev. 1351, 728 (1966).