1. The limited in vitro lifetime of human diploid cell strains;Hayflick;Exp. Cell Res.,1965
2. Replicative life-span of cultured human cells: effects of donor's age, tissue, ang genotype;Martin;Lab. Invest.,1970
3. Metabolic aspects of agng in diploid human cells;Cristofalo,1970
4. Progress in cytogerontology;Hayflick;Mech. Ageing Dev.,1979
5. Action of cortisone on human fibroblasts in vitro;Macleira-Coelho;Experientia,1966