1. R. M. Swanson, in Proceedings of 19th European Photovoltaic Solar Energy Conference (Paris, 2004), 2CV.2.63.
2. H. A. Aulich and F.-W. Schulze, in Proceedings of 17th European Photovoltaic Solar Energy Conference (Munich, Germany, 2001), p. 65.
3. A. Goetzberger, in Proceedings of 17th European Photovoltaic Solar Energy Conference (Munich, Germany, 2001), p. 9.
4. G. P. Willeke, in Proceedings of 19th European Photovoltaic Solar Energy Conference (Paris, 2004), 2CP.1.1.
5. R. Einhaus, D. Sarti, S. Pleier, et al., in Proceedings of 16th European Photovoltaic Solar Energy Conference (Glasgow, UK, 2000), O.D5.5.