Bates RG.Uterine activity in the second of labor and the effect o f epidural analgesia.Br J Obsets Gynecol,1985,92:1246.
Bates RG.Uterine activity in the second of labor and the effect o f epidural analgesia.Br J Obsets Gynecol,1985,92:1246.
何孔源,李树人.分娩镇痛法的临床应用与观察.中华麻醉学杂志,1989,9(2):102.