1. Y. Aharonov and L. Vaidman,Phys. Lett. A 178, 38 (1993).
2. Y. Aharonov, J. Anandan, and L. Vaidman,Phys. Rev. A 47, 4616 (1993).
3. L. I. Schiff,Quantum Mechanics (McGraw-Hill, New York, 1968), pp. 289?291.
4. W. G. Unruh, ?The reality and measurement of the wave function,? unpublished.
5. S. Kobayashi and K. Nomizu,Foundations of Differential Geometry, Vol. II (Wiley, New York, 1969).