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2. Controlled trial of fetal intensive care;Renou;Am. J. Obstet. Gynecol,1976
3. Abnormal fetal heart rate patterns and fetal acid base balance in low birth weight infants in relationship to respiratory distress syndrome;Hobel;Obstet. Gynecol,1972
4. Fetal heart rate patterns and neonatal death in low birth weight infants;Martin;Obstet. Gynecol,1974
5. Effect of fetal monitoring on neonatal death rates;Neutra;New Engl. J Med,1978