1. Contraction stress test for antepartum fetal evaluation;Schifrin;Obstet Gynecol,1975
2. Antepartum fetal evaluation: development of a fetal biophysical profile;Manning;Am J Obstet Gynecol,1980
3. The nonstress test: a review of 3,000 tests;Phelan;Am J Obstet Gynecol,1981
4. Amniotic fluid volume assessment with the four-quadrant technique at 36-42 weeks' gestation;Phelan;J Reprod Med,1987
5. The 4 quadrant assessment of amniotic fluid volume: An adjunct to antepartum fetal heart rate testing;Rutherford;Obstet Gynecol,1987