(en) Eliahu Levitas, Eitan Lunenfeld, Noemi Weisz, Michael Friger et Iris Har-Vardi, « Seasonal variations of human sperm cells among 6455 semen samples : a plausible explanation of a seasonal birth pattern », American Journal of Obstetrics and Gynecology, vol. 208, no 5, , p. 406.e1–406.e6 (PMID23395928, DOI10.1016/j.ajog.2013.02.010).
(en) Eliahu Levitas, Eitan Lunenfeld, Noemi Weisz, Michael Friger et Iris Har-Vardi, « Seasonal variations of human sperm cells among 6455 semen samples : a plausible explanation of a seasonal birth pattern », American Journal of Obstetrics and Gynecology, vol. 208, no 5, , p. 406.e1–406.e6 (PMID23395928, DOI10.1016/j.ajog.2013.02.010).