1. Analysis of heart rate patterns preceeding fetal death;Gaziano;Obstet Gynecol,1977
2. FHR variability and other heart rate observations during second stage of labor;Gaziano;Obstet Gynecol,1980
3. Grundlagen und Klinische Wertigkeit der Kardiotokographie;Fischer,1976
4. Intrapartum fetal heart rate monitoring. I. Classification and prognosis of fetal heart rate patterns;Krebs;Am J Obstet Gyecol,1979
5. Abrupt fall in fetal heart rate during labor;Odendaal;S. Afr Med J,1994