3Murphy M P, O'Neill L A J eds. What is life? The Next Fifty Years. London: Cambridge University Press, 1995,1997.
4Schroedinger E. What is life? The Physical Aspect of the Living Cell. London: Cambridge University Press (many printings since 1944 in various languages).
5Tang P S, Wang C S. J. Chem. Phys. , 1941,45:443.