4Chan SY,Wang C,Ng M,et al.Evaluation of computerized analysis of sperm movement characteristics and differential sperm tail swelling patterns in predicting human sperm in vitro fertilizing capacity.J Androl 1989;10(2):133-138
2WHO. Laboratory manual for the examination of human semen and sperm-cervical mucus interaction (Third edition)[M]. Cambridge :Cambridge University Press,1992.3-14.
3Johnston RC. Correlation of semen variables and pregnancy rate for donor insemination: a 15 gears retrospective[J]. Fertile Steril,1994,6(1):355.