4H Imai, K Niwa ,A Irilani. Penetration in vitro of zona-free hamster eggs by ejaculated boar spermatozoa[J].Reprod Fert, 1977, 51,495-497.
5Toyoda Y,Chang M C. Capacitation of epididymal spermatozoa with high K/Na ratio and cyclic AMP for the fertilization of rat eggs in vitro [J]. Reprod Fert, 1974, 36, 125-134.
7Wang C, Lee G S, Leung A,et al. Human sperm hyperactivation and acrosome reaction and their relationships to human in vitro fertilization [J].Fertil Steril, 1993 ,59 (6): 1221-7.
8Davis R O, KatzD F .Standardization and comparability of CASA instruments[J] .Andrology, 1992,13( 1 ):81-86.