1. 11th IEEE Photovoltaic Specialists Conf.;Statler,1975
2. 12th IEEE Photovoltaic Specialists Conf.;Statler,1976
3. 2nd Int. Workshop on the Physics of Semiconductor Devices;Faraday,1983
4. 13th IEEE Photovoltaic Specialists Conf.;Walker,1978
5. Testing solar cells in space