1. Proc. 1st World Renewable Energy Congr.;Hamakawa,1990
2. Amorphous Semiconductor Technologies and Devices;Hamakawa,1982
3. 3rd New Energy Industrial Symp.;Uchida,1983
4. Proc. 19th IEEE Photovoltaic Specialists' Conf.;Nakano,1987
5. JPS Spring Meet.;Ishibitsu,1984