1. F. J. Belinfante:A Survey of Hidden-Variables Theories (Pergamon Press, Oxford, 1973).
2. K. Popper:Realism in quantum mechanics and a new version of the EPEexperiment, InOpen Questions in Quantum Physics, edited byG. Tarozzi andA. van der Merwe (Reidel, Dordrecht, 1984).
3. A. Einstein, B. Podolsky andN. Rosen:Phys. Rev.,47, 777 (1935).
4. O. Piccioni: inOpen Questions in Quantum Physics, edited byG. Tarozzi andA.Ven der Merwe (Reidel, Dordrecht, 1984).