6. A. Einstein, B. Podolsky, and N. Rosen, Phys. Rev. [**47**]{}, 777 (1935). J. G. Cramer, Phys. Rev. D[**22**]{}, 362 (1980). J. G. Cramer, Rev. Mod. Phys. [**58**]{}, 647 (1986). P. A. M. Dirac, Proc. Roy. Soc. London A [**167**]{}, 148 (1938). J. A. Wheeler and R. P. Feynman, Rev. Mod. Phys. [**17**]{}, 157 (1945). J. A. Wheeler and R. P. Feynman, Rev. Mod. Phys. [**21**]{}, 425 (1949). J. E. Hogarth, Proc. Roy. Soc. A [**267**]{}, 365 (1962). F. Hoyle and J. V. Narlikar, Proc. Roy. Soc. A [**277**]{}, 1 (1964). F. Hoyle and J. V. Narlikar, Ann. of Phys. [**54**]{}, 207 (1969). P. C. W. Davies, J. Phys. A: Gen. Phys. [**5**]{}, 1722 (1972). P. C. W. Davies, The Physics of Time Asymmetry, Surrey University Press, London UK, 1974. K. Schwarzschild, Göttinger Nachrichten [**128**]{}. 132 (1903). H. Tetrode, Z. F. Physik, [**10**]{}, 317 (1922). A. D. Fokker, Z. F. Physik, [**58**]{}, 386 (1929); Physica [**12**]{}, 145 (1932). P. J. E. Peebles, Principles of Physical Cosmology, Princeton University Press, N. J., 1993. L. de Broglie, Tentative d’interpretation causale et non-linéaire de la méchanique, Gauthier-Villars, Paris (1956). D. Bohm, Phys. Rev. [**85**]{}, 166, 180 (1952). A. K. Ekert, Phys. Rev. Lett. 