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2. History of fetal monitoring;Goodlin;Am J Obstet Gynecol,1979
3. The electronic evaluation of the fetal heart rate;Hon;Am J Obstet Gynecol,1958
4. Control of the human fetal heart rate during labor;Caldeyro-Barcia,1966
5. The diagnosis of fetal distress with an electronic fetal heart monitor;Hammacher,1967