Clinical experience with the Hewlett-Packard M-1350A fetal monitor: correlation of Doppler-detected fetal body movements with fetal heart rate parameters and perinatal outcome.
Devoe L, Boehm F, Paul R, Frigoletto F, Penso C, Goldenberg R, Rayburn W, Smith C. Clinical experience with the Hewlett-Packard M-1350A fetal monitor: correlation of Doppler-detected fetal body movements with fetal heart rate parameters and perinatal outcome. Am J Obstet Gynecol. 1994 Feb; 170(2):650-5.