1. Varicocele;Saypol;J Androl,1986
2. Experience with 425 sub-fertile male patients;Greenberg;J Urol,1978
3. A consideration of sterility factors in the light of subsequent pregnancies. II. Subfertility in the male;Tulloch;Trans Edinburg Obstet Soc,1952
4. Nagler HM, Luntz RK, and Martinis FG: Varicocele, in Lipshultz LI, and Howards SS (Eds): Infertility in the Male, 3rd ed. St. Louis, Mosby–Year Book, 1997, pp 336–359.
5. Scrotal ultrasound in the infertile men;McClure;J Urol,1986