1. Conf. Rec. 25th IEEE Photovoltaic Spec. Conf., Washington, DC, May 13–17;Ford,1996
2. Conf. Rec. 25th IEEE Photovoltaic Spec. Conf., Washington, DC, May 13-17;Monna,1996
3. Proc. 14th Eur. Photovoltaic Sol. Energy Conf., Barcelona, Spain, June 30–July 4;Guk,1997
4. Proc. 14th Eur. Photovoltaic Sol. Energy Conf., Barcelona, Spain, June 30–July 4;Thorp,1997
5. Proc. 14th Eur. Photovoltaic Sol. Energy Conf., Barcelona, Spain, June 30–July 4;Takato,1997