1. Y. Yamaguchi:Phys. Rev.,95, 1628 (1954).
2. A detailed discussion of the nonlocal separable interaction can be found inA. G. Sitenko andV. E. Kharchenko: preprint ITF-68-11 (in Russian).
3. L. D. Faddeev:Žurn. Ėksp. Teor. Fiz.,39, 1459 (1960) (English translation:Sov. Phys. JETP,12, 1014 (1961)).
4. G. C. Ghirardi andA. Rimini:Journ. Math. Phys.,5, 722 (1964).
5. G. C. Ghirardi andA. Rimini:Journ. Math. Phys.,6, 40 (1965).