1. See. for example,F. A. Berezin:The Method of Second Quantization (New York, N. Y., 1966).
2. Y. Ohnuki andT. Kashiwa:Prog. Theor. Phys., in press.
3. This is essentially the same as the one for parafield operators. See, for example,H. S. Green:Phys. Rev.,90, 270 (1953).
4. Y. Ohnuki: private communication.
5. M. Omote, Y. Ohnuki andS. Kamefuchi: to be published.