1. W. S. CHEN, J. M. STEWART, B. J. STANBERY, W. E. DEVANEY and R. A. MICKELSEN, in Proceedings of the 19th IEEE Photovoltaic Specialists Conference (IEEE, New York, 1987) p. 1445.
2. H. W. SCHOCK, B. DIMMLER, H. DITTRICH, J. KIMMERLE and R. MENNER, in Proceedings of the 7th E. C. Photovoltaic Solar Energy Conference, Sevilla, 1986 (D. Reidel, Dordrecht, 1987) p. 465.
3. B. DIMMLER, H. DITTRICH, R. MENNER and H. W. SCHOCK, in Proceedings of the 19th IEEE Photovoltaic Specialists Conference (IEEE, New York, 1987) p. 1454.
4. D. CAHEN, A. KISILEV, V. MARCU, H. W. SCHOCK and R. NOUFI, in Proceedings of the 20th IEEE Photovoltaic Specialists Conference (IEEE, New York, 1988) p. 1437.
5. R. KLENK, R. H. MAUCH, R. MENNER and H. W. SCHOCK,ibid. p. 1443.