1. The serial cultivation of human diploid cell strains;Hayflick;Exp. Cell Res.,1961
2. Replicative lifespan of cultured human cells: effects of donor age, tissue and genotype;Martin;Lab. Invest.,1970
3. Lymphopoietic potential of bone marrow cells from aged mice: comparison of the cellular constituents of bone marrow from young and aged mice;Farrar;J. Immunol.,1974
4. Impaired thymic regeneration in lethally irradiated mice given bone marrow from aged donors;Tyan,1976
5. Exponential decrease during aging and random lifetime of mouse spermatogonial stem cells;Suzuki;Science,1978