Penetration of Human Eggs by Human Spermatozoa in vitro

R. McMaster, R. Yanagimachi, A. Lopata
1978 Biology of Reproduction  
The timing of sperm penetration through the zona peliucida, and fertilization of human eggs 7 17.3 85 (50/59) 100(131/131)
doi:10.1095/biolreprod19.1.212 pmid:687706 fatcat:uxkpfuhbgbbjhnfm6lyrp275pu