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3. G. W. Mackey,Mathematical Foundations of Quantum Mechanics (W. A. Benjamin, New York, 1963), pp. 61?67.
4. A. Fraenkel, Y. Bar Hillel, and A. Levy,Foundations of Set Theory, 2nd rev. ed. (North-Holland, Amsterdam, 1973), pp. 68?70.
5. P. A. Benioff,Phys. Rev. D 7, 3603 (1973).