1. Y. Ohsaka, T. Tozuka, and S. Takaki, U.S. Patent 4, 845, 268 (to Daikin Industries) [CA 104, 69315 (1986)].
2. Y. Ohsaka, Petrotech (Tokyo) 8, 840 (1985).
3. Y. Ohsaka, S. Takaki, and H. Sakai, European Patent 252, 454 (to Daikin Industries) [CA 108, 188896 (1988)].
4. Y. Ohsaka and S. Takaki, European Patent 326, 054 (to Daikin Industries) [CA 112, 98358 (1990)].
5. Y. Ohsaka and S. Khono, Japanese Patent 88-22, 572 (to Daikin Industries) [CA 109, 93808 (1988)].