1. Gavaudan, P.: 1967, inColloque sur les systèmes biologiques élémentaires et la biogenèse, Masson, Paris, pp. 12?16.
2. Locker, A. (ed.): 1973,Biogenesis, Evolution, Homeostasis, Springer-Verlag, New York.
3. Sagan, C.: 1974,Origins of Life,5, 529.
4. Webster's New Third International Dictionary: 1966, Merriam, p. 946.
5. West, M. W. and Ponnamperuma, C.: 1970,Space Life Sci. 2, 225?295.