ABSTRACT
Today it is difficult to keep one's research activity on one's own purely scientific interest mainly due to the rush of easy financial supports from some military sources (direct and/or indirect). The authors are indebted to Sisters of Namur Notre Dame for helping them to overcome the difficulty. They also wish to thank Professors H. Umezawa, Y. Takahashi, K. Pribram, L. Ricciardi and G. Vitiello for their suggestions
and helpful discussions.
