1. The prenatal origin of behavior;Hooker,1952
2. Reflex activity in the oral and facial area of the human fetus;Humphrey,1967
3. Suck and swallow in the premature infant;Gryboski;Pediatrics,1969
4. Fetal swallowing and regurgitation: observation of normal and abnormal activity;Bowie;Radiology,1982
5. Deglutition by normal and anencephalic fetuses;Pritchard;U.S. Obstet. Gynecol.,1965