1. Y. Tsuda, Y. Tsuda, M. Obata, K. Araki, J. Inui, and T. Nakamura, Patent 8,504,172 PCT Int.; Chem. Abstr.,104, 207298 (1986).
2. T. Mishina, Y. Tsuda, J. Inui, and Y. Mura, Patent 62,169,793 Jpn.; Chem. Abstr.,108, 56120 (1988).
3. Y. Tsuda, T. Mishina, M. Obata, K. Araki, J. Inui, and T. Nakamura, Patent 61,227,584 Jpn; Chem. Abstr.,106, 176416 (1987).
4. Y. Tsuda, T. Mishina, M. Obata, K. Araki, J. Inui, and T. Nakamura, Patent 6,310,183 Jpn.; Chem. Abstr.,109, 120988 (1988).
5. Y. Tsuda, T. Mishina, M. Obata, and J. Inui, Patent 61,263,977 Jpn.; Chem. Abstr.,106, 119901 (1987).