1. Assessment of Risks to Human Reproduction and to Development of the Human Conceptus from Exposure to Environmental Substances, Chapter 3;Galbraith,1982
2. Secular trend in reported sperm counts;James;Andrologia,1980
3. The male factor in fertility and infertility. II;MacLeod;Spermatozoon counts in 1000 men of known fertility and in 1000 cases of infertile marriage J Urol,1951
4. Frequency distribution of sperm counts in fertile and infertile males;Zukerman;Fertil Steril,1977
5. Sperm counts in fertile and infertile men;David;Fertil Steril,1979