1. Robinson A.,Non Standard Analysis (North-Holland, Amsterdam) 1970.
2. Farrukh M. O.,J. Math. Phys.,16 (1975) 177.
3. Kobayashi T.,Proceedings of the Symposium on Symmetries in Science VII (Plenum, New York, N.Y.) 1993, p. 287 and the preprint of the University of Tsukuba,An answer to the Schroedinger’s cat (Classical solutions of Schroedinger equations and nonstandard analysis), UTHEP-245 (1992).
4. Kobayashi T., to be published inProceedings of the III International Wigner Symposium,Oxford, England, 1993.
5. Kobayashi T., inProceedings of the International Symposium on Fundamental Problems in Quantum Physics, Oviedo, Spain, 1993, to be published inFound. Phys. Lett.