1. The effect of variation of hydrogen-ion concentration on the motility of human spermatozoa;Muschat;Surg Gynecol Obstet,1926
2. Chemical and physical properties of semen;Mann,1954
3. Cervixslijm, Thesis;Kroeks;Rijksuniversiteit Utrecht,1976
4. The acidity of sperm;Sergin;Anim Breed Astr,1935
5. The buffering capacity of bull semen;Smith;Cornell Vet,1940