1. Relative incidence of etiological disorders in male infertility;Baker,1986
2. World Health Organization (1987) Towards more objectivity in diagnosis and management of male infertility. Int. J. Androl. (Suppl. 7), 1–53
3. Pathophysiology and natural history of male infertility;Bhasin;J. Clin. Endocrinol. Metab.,1994
4. Estimating familial and genetic contributions to variability in human testicular function: a pilot twin study;Handelsman;Int. J. Androl.,1997
5. Case-control study of whether subfertility in men is familial;Lilford;Br. Med. J.,1994