1. L de Broglie, Electrons et Photons (Gauthier-Villars, Paris, 1928) p. 105
2. D Bohm, Phys. Rev. 85, 166 (1952); Phys. Rev. 85, 180 (1952)
3. J S Bell, Speakable and unspeakable in quantum mechanics (Cambridge University Press, Cambridge, 1987) p. 160
4. P Holland, Ann. Phys. 315, 505 (2005)
5. G Bowman, Am. J. Phys. 70, 313 (2002)