1. Proc. 11th IEEE Photovoltaic Specialists Conf., Scottsdale, AZ, 1975 (IEEE, New York).
2. Proc. 12th IEEE Photovoltaic Specialists Conf., Baton Rouge, LA, 1976 (IEEE, New York).
3. Proc. 13th IEEE Photovoltaic Specialists Conf., Washington, DC, 1978 (IEEE, New York).
4. Proc. 14th IEEE Photovoltaic Specialists Conf., San Diego, CA, 1980 (IEEE, New York).
5. Proc. 15th IEEE Photovoltaic Specialists Conf., Kissimee, FL, 1981 (IEEE, New York).