1. Adrian TE (1993) Gastrointestinal hormones. In: Gluckman PD, Heymann MA (eds) Permatal and pediatric pathophysiology: a clinical perspective. Hodder and Stoughton Ltd, Boston, pp 384–390
2. Aynsley-Green A (1991) Endocrine function of the gut in early life. In: Walker AW (ed) Pediatric gastrointestinal disease, 2 vols. B. C. Decker, Philadelphia, pp 1:236–255
3. Bernbaum Pereira GR, Watkins JB, Peckham GJ (1983) Nonnutritive sucking during gavage feeding enhances growth and maturation in premature infants. Pediatrics 71:41–45
4. Berseth CL (1989) Gestational evolution of small intestine motility in preterm and term infants. J Pediatr 115:646–651
5. Berseth CL (1990) Neonatal small intestinal motility: motor responses to feeding in term and preterm infants. J. Pediatr 117:777–782