1. Altman, P.L. and Dittmer, D.S. (1962), Lifespans: mammals. In Growth. Biological Handbook, Fed. Am. Soc. Exp. Biol., Washington, D.C., pp. 445–450.
2. Blessed, G., Tomlinson, B.E. and Roth, M.L. (1968), The association between quantitative measures of dementia and of senile change in the cerebral grey matter of elderly subjects, Brit. J. Psychiat., 113: 797.
3. Bodmer, W.F. and Bodmer, J.G. (1978), Evolution and function of the HLA system, Brit. Med. Bull. 34: 309.
4. Brooks, A.L., Mead, D.K. and Peters, R.F. (1973), Effect of aging on frequency of metaphase chromosome aberrations in liver of Chinese hamster, J. Gerontol. 28: 452.
5. Comfort, A. (1979), The Biology of Senescence, Elsevier, New York.