1. Y. Yagi, H. Kishi, R. Hagihara, S. Kozuma, T. Tanaka, T. Ishida, K. Uchihashi, S. Kiyama, S. Nakano, Evaluation And Analysis of Long-Term Operation Data For a Grid-Connected PV Generation System. Fourth NESC, 1999, pp. 113–117.
2. R. Hagihara, Y. Yagi, H. Kishi, T. Ishida, K. Uchihashi, S. Kiyama, A. Tanaka, T. Tsurusaki, H. Nakagami, T. Fujita, H. Fukami, Estimates and Results of Analysis for Grid-Connected PV Generation Systems for Residential Houses in the Tokyo Area, Proceedings of the JSES/JWEA joint Conference, 1998, pp. 53–56.
3. K. Kurokawa, D. Uchida, K. Otani, T. Sugiura, Realistic PV Performance Values Obtained By a Number Of Grid-Connected Systems in Japan, North Sun ’99, 1999, pp. 11–14.
4. A. Itagaki, H. Okamura, K. Hattori, M. Yamada, H. Iida, Preparation of Hourly Solar Radiation Data on inclined Surface Named METPV at 150 Meteorological Stations Throughout Japan, Proceedings of the JSES/JWEA joint Conference, 1998, pp. 105–108.