1. K. Bucher, Proc. 13th EC Photovoltaic Solar Energy Conference, H.S. Stephens & Associates, 1995, p. 2097.
2. H. Gabler, M. Raetz, E. Wiemken, Proc. 12th EC Photovoltaic Solar Energy Conference, H.S. Stephens & Associates, 1994, p. 879.
3. IEC Standards 891 and 1215, Bureau Central de la Commission Electrotechnique Internationale, Geneva.
4. R. Preu, G. Kleiss, K. Reiche, K. Bucher, Proc. 13th EC Photovoltaic Solar Energy Conference, H.S. Stephens & Associates, 1995, p. 1465.
5. S. Lanzerstorfer, G. Bauer, H. Wilk, Proc. 13th EC Photovoltaic Solar Energy Conference, H.S. Stephens & Associates, 1995, p. 2294.