1. (1964) Ageing: The Biology of Senescence. Holt, Rinehart and Winston Inc., N. Y. P. 22.
2. (1966) Biological Mechanisms of Aging. Charles C Thomas, Publisher, Springfield, Ill. pp. 8-9.
3. The limited in vitro lifetime of human diploid cell strains
4. and (1969) Interdivision time distribution for the human diploid cell strain, WI-38. J. Cell. Physiol., in press.