1. Boeyens, J.C.A. (2005): New Theories for Chemistry, Elsevier, Amsterdam.
2. Boeyens, J.C.A. (2010): Emergent Properties in Bohmian Chemistry, in M.V. Putz (ed.), Quantum Frontiers of Atoms and Molecules, NOVA, New York.
3. Einstein, A. (1950): The Meaning of Relativity, 4th ed., 1950, Methuen, London.
4. Einstein, A. & W. de Sitter (1932): On the relation between the expansion and the mean density of the universe, Proc. Nat. Acad. Sci., 1932 (18)213-214.
5. Feynman, R.P. (1990): QED, Penguin Books, London, p. 129.