Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Wen Xuan Wu and Xiao Hong Ma and Peter W. Nathanielsz,"Changes in prostacyclin synthase in pregnant sheep myometrium, endometrium, and placenta at spontaneous term labor and regulation by estradiol and progesterone",American Journal of Obstetrics and Gynecology,0002-9378,Elsevier BV,1999-03,180,3,744-749,https://cir.nii.ac.jp/crid/1360574095814558080,https://doi.org/10.1016/s0002-9378(99)70282-6