1. Y. Goto, M. Watanabe, T. Sakaya, R. Nadano, JP Patent 2000247923 (2000) [CAN 133:222325]
2. R. Nadano, T. Sakaya, M. Watanabe, Y. Goto, T. Nakamichi, S. Suenaga, JP Patent 2000143575 (2000) [CAN 132:334213]
3. M. Kanai, T. Sakaya, M. Watanabe, Y. Goto, R. Nadano, EP Patent 872468 (1998) [CAN 129:289881]
4. M. Kanai, T. Sakaya, M. Watanabe, Y. Goto, JP Patent 10287609 (1998) [CAN 129:330468].
5. Y. Oda, M. Yanakawa, JP Patent 2000063306 (2000) [CAN 132:180281]