1. Bartlett Z (2014) The Hayflick limit. In: Embryo project Encyclopedia, pp 11–14. ISSN: 1940-5030 http://embryo.asu.edu/handle/10776/8237
2. Beard RE (1959) Note on some mathematical mortality models. In: Wolstenholme GEW, O’Connor M (eds) The lifespan of animals. Ciba Foundation Colloquium on Ageing. Little, Brown, Boston
3. Ben-Haim MS, Kanfi Y, Mitchell SJ et al (2018) Breaking the ceiling of human maximal life span. J Gerontol A Biol Sci Med Sci 73(11):1465–1471. https://doi.org/10.1093/gerona/glx219
4. Benson AL (1909) Learning the length of life – many new facts brought to light – curious investigations recently made by various experts indicate future progress in pursuit of longevity. http://query.nytimes.com/mem/archive-free/pdf?res9B01E5D91539E733A25755C1A9639C946897D6CF
5. Buffon G (1749) Natural history, general and particular, with a description of the King’s cabinet. Paris 2:569