1. Concealment of ovulation, parental care, and human social evolution;Alexander,1979
2. Human sperm competition: Copulation, masturbation and infidelity;Baker,1995
3. Ligamentous strength measurements in pre-pubescent and pubescent rats;Booth;Growth,1970
4. Vocal cues of ovulation in human females;Bryant;Biology Letters,2009
5. The length and variability of the human menstrual cycle;Chiazze;Journal of the American Medical Association,1968