1. P. A. M. Dirac, The Principles of Quantum Mechanics.
2. K. Hepp, Helv. Phys. Acta
45, 237 (1972).
3. A more extreme position would be that the beables need refer only to mental events.
4. N.Bohr.
5. H. Primas, Advanced Quantum Chemistry of Large Molecules, Vol. 1: ‘Concepts and Kinematics of Quantum Mechanics of Large Molecular Systems’, Academic Press, New York (1973), and preprint (July 1972).