1. Neue Gesichtspunkte zur Atiologie der mannlichen Infertilitat;Amelar;Extr. Urol.,1978
2. Aetiological factors of male infertility in ibadan, Nigeria;Awojobi;Afr. J. Med. Sc.,1983
3. Descent of the testis in relation to temperature;Badenoch;Br. Med. J.,1945
4. The male factor in infertility-Nigerian experience;Chukudebelu;Int. J. Fertil.,1978
5. Towards an objective evaluation of signs and symptoms in male infertility;Comhaire;Int. J. Androl.,.,1987