1. E.P. Wigner, CP-B, VI — pp. 156-7, pp. 165-9, 177-180, p. 202.
2. John von Neumann, Mathematical Foundations of Quantum Mechanics, Princeton University Press, Princeton, 1955, translated by R.T. Beyer from Mathematische Grundlagen der Quantenmechanik, Springer, Berlin, 1932.
3. F.W. London and E. Bauer, La théorie de l'observation en mécanique quantique, No. 775 of Actualités scientifiques et industrielles, Hermann, Paris, 1939, pp. 42-43 [author's translation].
4. E.P. Wigner, Ref. [1], p. 255 (fn. 10).
5. Oxford Book of Quotations, revised 4th edition, ed. A. Partington, Oxford University Press, Oxford — New York, 1996.