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2. L.D. Landau: Proceedings of the 1959 Annual International Conference on High-Energy Physics at Kiev, Soviet Academy of Sciences, 1959; see also: Nuclear Phy. 13 (1959) 181
3. J. von Neumann, “Mathematical Foundations of Quantum Mechanics”, Princeton University Press (1955). (Translated by R.T. Beyer)
4. G.C. Ghirardi, A. Rimini, T. Weber: Phys Rev D 34 (1986) 470
5. S. Tomonaga: Prog Theo Phys 1 (1946) 27