Rolf C, Behre HM, Nieschlag E. Reproductive parameters of older compared to younger men of infertile couples. (1996)
van Noord-Zaadstra BM, Looman CW, Alsbach H, Habbema JD, te Velde ER, Karbaat J. Delaying childbearing: effect of age on fecundity and outcome of pregnancy(1991)
Olsen J. Subfecundity according to the age of the mother and the father. (1990)
Hassold T, Chiu D. Maternal age-specific rates of numerical chromosome abnormalities with special reference to trisomy. Hum Genet. (1985)
Schwartz D, Mayaux MJ. Female fecundity as a function of age: results of artificial insemination in 2193 nulliparous women with azoospermic husbands.(1982)