1. W. Palz, J. Besson, Duy T. Nguyen, et al., Conf. Rec. Ninth IEEE Photovolt. Special Conf., Silver Spring, Md., New York (1972), pp. 91?105.
2. J. Besson, Duy T. Nguyen, A. Gauthier, et al., Eleventh IEEE Photovolt. Spec. Conf., Scotts-dale, Ariz., New York (1975), pp. 468?475.
3. H. Matsumoto, N. Nakayand, and H. Yamaguchi, Jpn. J. Appl. Phys.,15, No. 9, 1849?1850 (1976).
4. H. W. Windawi. Eleventh IEEE Photovolt. Spec. Conf., Scottsdale, Ariz., New York (1975), pp. 464?467.
5. T. M. Razykov and M. A. Razykov, Geliotekhnika, No. 2, 29?31 (1981).