1. H. Aiga, M. Kawakami, R. Tsukahara, R. Uchida, and K. Sonoda, Japan Patent 79 38,332 (1979)
2. Chem. Abstr., 91, 75704v (1979).
3. T. Niwa, Y. Murata, and S. Maeda, Japan Patent 60,152,563 (1985)
4. Chem. Abstr., 104, 111354d (1986).
5. Mitsubishi Chemical Industries Co., Ltd., Japan Patent 60 27,594 (1985)