1. M. Bitbol and E. Ruhnau, eds., Now, Time and Quantum Mechanics (Frontières, 1994).
2. G. W. F. Hegel, The Phenomenology of Mind, translation by J. B. Baillie (Library of Philosophy, 1931), Part A, Chap. I.
3. E. Ruhnau, “The now, the missing link between matter and mind,” in M. Bitbol and E. Ruhnau, eds., op. cit. [1].
4. K. Popper, Postscript to the Logic of Scientific Discovery (Hutchinson, 1982), §26.
5. E. Ruhnau, “The now, the missing link between matter and mind,” in M. Bitbol and E. Ruhnau, eds., op. cit. [1]. About the theme of the missing now, see also: J. Schneider, “The now, relativity theory and quantum mechanics”; S. Saunders, “Time and quantum mechanics,” in M. Bitbol and E. Ruhnau, eds., op. cit. [1]. According to S. Saunders, for instance, in both cases (quantum mechanics without state reduction and spacetime theory without ‘time flow’) something fundamental seems to be missing in physics; M. Bitbol, “The missing now,” Contextos (University of Leon, Spain) VI (11), 17–31 (1988).