Ray M, Freeman R, Pine S, Hesselgesser R (September 1972). "Clinical experience with the oxytocin challenge test". Am. J. Obstet. Gynecol. 114 (1): 1–9. doi:10.1016/0002-9378(72)90279-7. PMID4637035.
Ray M, Freeman R, Pine S, Hesselgesser R (September 1972). "Clinical experience with the oxytocin challenge test". Am. J. Obstet. Gynecol. 114 (1): 1–9. doi:10.1016/0002-9378(72)90279-7. PMID4637035.