Modulation of uterine prostaglandin secretion by the selective progesterone receptor modulator (SPRM) asoprisnil, progestins, and antiprogestins in cycling and ovariectomized guinea pigs - Elger,W.; Ivell,R.; Nandy,A.; Rasch,A.; Triller,A.; Chwalisz,K. (Fertil Steril, 2004)