1. For example, see; E. Schrödinger, 1931, Sitzungsb. Preuss. Akad. W. 144; Metadier, J., 1931, Comptes Rendus, 193, 1173; Furth, R., 1933, Zeits. f. Phys. 81, 143.
2. von Neumann, J. 1932, Mathematische Grundlagen der Quanten Mechanik (Springer, Berlin).
3. Bohm, D., 1952, Phys. Rev. 85 166.
4. Vigier, J. P. and Roy, S., 1985, Hadronic J. Suppl., 1, 475.
5. For example, see; Takabayashi, T., 1984, Proc. of the International Symposium on Foundations of Quantum Mechanics (Phys. Soc. Japan, Tokyo), eds. S. Kamefuchi et al, p. 44.