6Spitz IM, Croxatto HB, Robbins A. Antiprogestins : mechanism of action and contraceptive potential. Annu Rev Pharmacol Toxicol,1996,36:47.
7Spitz IM, Bardin CW. Clinical pharmacology of RU486 : an antiprogestin and antiglucocorticoid, Contraception, 1993,48:403
8Elliott CL, Brennand JE, Calder AA. The effects of mifepristone on cervical ripening and labor induction in primigravidae. Obstet Gynecol, 1998,95(5) :804 - 809.
9Hill NCW, Selinger M, Ferguson J, et al, The placental transfer of mifepristone(RU486) during the second trimester and its influence upon maternal and fetal steroid concentration, Br J Obstet Gynaecol,1990.97:406 -411.
10Chen SH,et al. RU486 ingibit ovulation ferlilization and early embryonic development in rabbits: in vivo end in vitro studies. Fertil Steril,1995,64:6273.