1. Photon International (March 2009), p. 170.
2. M. A. Green, K. Emery, Y. Hishikawa, W. Warta, and E. D. Dunlop, Progr. Photovolt.: Res. Appl. 20, 606 (2012).
3. R. R. King, A. Boca, W. Hong, X.-Q. Liu, D. Bhusari, D. Larrabee, K. M. Edmondson, D. C. Law, C. M. Fetzer, S. Mesropian, and N. H. Karam, in Proceedings of the 24th EU Photovoltaic Solar Energy Conference, 21–25 Sept. 2009 (Hamburg, 2009), p. 55.
4. V. Fthenakis, S. Gualtero, R. van der Meulen, and N. S. Kim, Mater. Res. Soc. Symp. Proc. 1041, 25 (2008).
5. S. R. Wronsky. Mater. Res. Soc. Symp. Proc. 469, 7 (1997).