1. Proc. 19th IEEE Photovoltaic Specialists' Conf.;Green,1987
2. Proc. 8th European Communities Photovoltaic Solar Energy Conf.;Green,1988
3. Proc. 3rd European Communities Photovoltaic Solar Energy Conf.;Larue,1980
4. Proc. 15th IEEE Photovoltaic Specialists' Conf.;Gupta,1981
5. Proc. 15th IEEE Photovoltaic Specialists' Conf.;Arnett,1981