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29. Electronic evaluation of fetal heart rate. XI. Description of a spiral electrode. Hon EH, Paul RH, Hon RW. Obstet Gynecol; 1972 Sep; 40(3):362-5. PubMed ID: 5054966 [No Abstract] [Full Text] [Related]
30. [Another scalp electrode for direct fetal electrocardiography sub partu]. Rüttgers H, Kubil F. Geburtshilfe Frauenheilkd; 1971 Jul; 31(7):654-60. PubMed ID: 5563831 [No Abstract] [Full Text] [Related]