1. M. Kirchgessner, A.M. Reichlamyr-Lais, and F. J. Schwartz, Prog.Clin.Biol.Res. 77: 189 (1981).
2. C.F. Mills, Ann.Rev.Nutr. 5: 173 (1985).
3. H.H. Sandstead, J.Lbb. Clin. Med. 98:457(1981)
4. I.M. Lerner, “Genetic homeostasis’ Dover Publications, New York (1970).
5. W.R. Ashby, “An introduction to cybernetics”, John Wiley and Sons Inc., New York (1965).