1. L.E. Ballentine, Rev. of Modem Phys.
42 (1976) 358.
2. R.S. van Dyck, P.B. Schwinberg, H.G. Dehmelt, in The electrons, D. Hestness and A. Weingartshofer eds (Klower Acad. Publ., Netherlands) 1991, p. 239.
3. N. Bohr, Atomic Theory and the Description of Nature (Cambridge Univ. Press) 1934;Atomic Physics and Human Knowledge (Wiley, New York) 1958.
4. J. von Neumann, Mathematische Grundlagen der Quanten Mechanik (Verlag-Springer, Berlin) 1932.
5. D. Böhm, J. Bub, Rev. Mod. Phys.
38 (1966) 453,