1. D. Sarti and R. Einhaus, Solar Energy Materials and Solar Cells 2002, vol. 72, no. 1-4, pp. 27-40.
2. N.B. Mason: Proceedings of the Photovoltaic Science, Applications & Technology Conference, Durham, 2007, pp. 43–46.
3. A. Lotnyk, O. Breitenstein and H. Blumtritt, Solar Energy Materials & Solar Cells 2008, vol. 92, pp. 1236-1240.
4. L. Zhang, E. Øvrelid, S. Senanu, B. Agyei-Tuffour, and A.N. Femi: Rewas2008: 2008 Global Symposium on Recycling, Waste Treatment and Clean Technology, TMS, Warrendale, PA, 2008, pp. 1011–26.
5. O. S. Fishman, Advanced materials & processes 2008, vol. 166, no. 10, pp. 33-34.