1. Why are twins dissimilar?;Babson;Pediatrics,1964
2. Growth and development of twins dissimilar in size at birth;Babson;N Engl J Med,1973
3. Ultrasonic growth patterns in normal and discordant twins;Crane;Obstet Gynecol,1980
4. Birth weight in twins: an analysis of discordancy and growth retardation;Obrien;Obstet Gynecol,1986
5. Ultrasonic diagnosis of discordant fetal growth in twin gestations;Storlazzi;Obstet Gynecol,1987