1. C. F. von Weizsäcker,Aufbau der Physik (Carl Hanser Verlag, Munich, 1986), 2nd edn.
2. L. E. Ballentine inNew Techniques and Ideas in Quantum Measurement Theory, D. M. Greenberger, ed.Ann. N.Y. Acad. Sc. 480, 382 (1986).
3. This is best expressed in the famous statement, ?I think I can safely say that nobody today understands quantum mechanics,? in R. P. Feynman,The Character of Physical Law, M.I.T. Press, (Cambridge, Mass., 1965).
4. R. V. L. Hartley,Bell Syst. Tech. J., July 1928, p.535.
5. C. E. Shannon,Bell Syst. Tech. J. 27, 379 (1948).