1. E. Schrödinger, What is Life? (Cambridge University Press, Cambridge, 1946)
2. E. Broda, Ludwig Boltzmann, Man—Physicist—Philosopher (Ox Bow Press, Woodbridge, 1983). translated from the German
3. J. Monod, Chance and Necessity (Vintage, New York, 1971)
4. L. Brillouin, Negentropy principle of information. J. Appl. Phys. 24(1152) (1953)
5. P.-O. Löwdin, Rev. Mod. Phys. 35 (1963)