1. T. Uematsu, Y. Yazawa, Y. Miyamura, S. Muramatsu, H. Ohtsuka, K. Tsutsui, J. Minemura, Proceedings of the 11th International Photovoltaic Science and Engineering Conference, Sapporo, Japan, September 1999, pp. 957–958.
2. T. Uematsu, T. Warabisako, Y. Yazawa, S. Muramatsu, H. Ohtsuka, K. Tsutsui, J. Minemura, Y. Miyamura, Proceedings of the Second World Conference on Photovoltaic Solar Energy Conversion, Vienna, Austria, July 1998, pp. 1570–1573.
3. T. Warabisako, T. Uematsu, Y. Yazawa, H. Ohtsuka, S. Muramatsu, K. Tsutsui, J. Minemura, Y. Miyamura, Proceedings of the Second World Conference on Photovoltaic Solar Energy Conversion, Vienna, Austria, July 1998, pp. 1226–1231.
4. P.C. Eames, A. Zacharopoulos, D. McLarnon, B. Norton, T.M. Bruton, R. Russell, K.C. Heasman, Proceedings of the Second World Conference on Photovoltaic Solar Energy Conversion, Vienna, Austria, July 1998, pp. 2206–2209.