Harlap, Susan (June 28, 1979). "Gender of Infants Conceived on Different Days of the Menstrual Cycle". The New England Journal of Medicine. 300 (26): 1445–8. doi:10.1056/NEJM197906283002601. PMID449885.
Diasio, Robert B.; Glass, Robert H. (May 1971). "Effects of pH on the Migration of X and Y Sperm". Fertility and Sterility. 22 (5): 303–305. doi:10.1016/S0015-0282(16)38224-3. PMID4102480.
Harlap, Susan (June 28, 1979). "Gender of Infants Conceived on Different Days of the Menstrual Cycle". The New England Journal of Medicine. 300 (26): 1445–8. doi:10.1056/NEJM197906283002601. PMID449885.
Diasio, Robert B.; Glass, Robert H. (May 1971). "Effects of pH on the Migration of X and Y Sperm". Fertility and Sterility. 22 (5): 303–305. doi:10.1016/S0015-0282(16)38224-3. PMID4102480.