1. and ?Performance of a 350 kW photovoltaic concentrator field (in operation since 1981)?, in 11th E.C. Photovoltaic Solar Energy Conf., Montreux, Switzerland, 12-16 October, 1992, pp. 1340-1343.
2. and (Eds.), Renewable Energy, Sources for Fuels and Electricity, Island Press, Washington, 1993.
3. 27.5-percent silicon concentrator solar cells
4. and ?23% module and other silicon solar cell advances?, in Proc. 2nd World Conf. and Exhibition on Photovoltaic Solar Power Energy Conversion, Vienna, 6-10 July, 1998, pp. 1187-1192.
5. and ?Over 35% efficient GaAs/GaSb stacked concentrator cell assemblies for terrestrial applications?, in Proc. 21st IEEE Photovoltaic Specialists Conf., Orlando, Florida, 1990.