a. Van Zyl, J. A. (1972). A Review of the Male Factor in 231 Infertile Couples, S. A. Journal of Obstetrics and Gynaecology, 29 July, pp. 17 – 23.

b. Makler, A. (1986). Evaluation and Treatment of the Infertile Male. In DeCherney, A. H. (Ed.) Reproductive Failure. New Your, NY: Churchill Livingston, pp. 51 – 71.

c. Politoff, L., Birkhauser, M., Almendral, A., and Zorn, A. (1989). New Data Confirming a Circannual Rhythm in Spermatogenesis, Fertility and Sterility, Vol. 52, No. 3 (Sept.), pp. 486 – 489.

d. Polinsky, F. F. and Lamb, E. J. (1989). Analysis of Three Laboratory Tests Used in the Evaluation of Male Fertility: Bayes’ Rule applied to the Postcoital Test, the in Vitro Mucus Migration Test, and the Zona-Free Hamster Egg Test. Fertility and Sterility, Vol. 51, No. 2 (Feb.), pp. 215 – 228.

e. Poland, M. L., Moghissi, K. S., Giblin, P. T., Ager, J. W., and Olson, J.M. (1985). Variation of Semen Measures within Normal Men. Fertility and Sterility, Vol. 44, No. 3 (Sept.), pp. 396 – 400.

f. Wallace, E. M., Aitken, R. J., and Wu, F. C. W. (1992). Residual Sperm functions in Oligozoospermia Induced by Testosterone Enanthate Administered as a Potential Steroid Male Contraception. International Journal of Andrology, Vol. 15, pp. 416 – 424.

g. Snyder, P. J. (1990). Fewer sperm in the Summer: It’s Not the Heat, Its…. New England Journal of Medicine, July 5, pp. 54 – 56.

h. De Geyter, CH, De Geyter, M., Schneider, H. P. G., and Nieschlag, E.(1992). Subnormal Sperm Parameters in Conventional Semen analysis Are Associated with Discrepancies Between Fertilization and Pregnancy Rates in In-Vitro Fertilization and Embryo Transfer. International Journal of Andrology, Vol. 15, pp. 485 – 497.

i. Holland-Moritz, H. and Krause, W. (1992). Semen Analysis and Fertility Prognosis in Andrological Patients. International Journal of Andrology, Vol. 15, pp. 473 – 484.

j. Connor, S. (1992). Scientists Note Dramatic Decline in Sperm Count. San Francisco Examiner, March 8, pp. A1 & A14.