Doublet PM, Benson CB, Nadel AS, et al: “Improved birth weight table for neonates developed from gestations dated by early ultrasonography.” Journal of Ultrasound Medicine. 16:241, 1997.
Hadlock FP, Shah YP, Kanon DJ, et al. “Fetal crown rump length: Reevaluation of relation to menstrual age with high resolution real-time US Radiology.” 182:501, 1992.
Usher R, McLean F. “Intrauterine growth of live-born Caucasian infants at sea level: Standards obtained from measurements in 7 dimensions of infants born between 25 and 44 weeks of gestation.” Pediatrics. v.74, 1969