1. T. Bastin,Beyond Quantum Theory, Cambridge Univ. Press (1971).
2. M. Born,Z. Phys. 38, 803 (1926);Atomic Physics, Blackie & Son (1944), pp. 140?141.
3. R. Wilder,Foundations of Mathematics, Wiley (1952), Chapter 9.
4. A. Tarski,Introduction to Logic, Oxford (1965), Chapters 1, 2, and 6.
5. W. M. Honig,Bull. APS 18, 144 (1973);Bull. APS 12, 123 (1967).