1. 23rd IEEE Photovoltaic Specialist Conf.;Green,1993
2. 6th Int. Photovoltaic Science and Engineering Con. (PVSEC-6);Bruton,1992
3. 1994 IEEE First World Conf. on Photovoltaic Energy Conversion;Honsberg,1994
4. First WCPEC;Sterk,1994
5. First WCPEC;Zhao,1994