1. The twin-study method in medicine and genetics;Becker;Postgraduate Medicine,1967
2. Discordant deformities of lip and palate in monozygotic twins: A report of 2 sets of twins;Boo-Chai;Singapore Medical Journal,1966
3. A report on three unusual cleft lips;Braithwaite;British Journal of Plastic Surgery,1949
4. The role of environmental factors in the aetiology of so-called congenital malformations;Douglas;Plastic and Reconstructive Surgery,1958
5. Inheritance of Harelip and Cleft Palate;Fogh-Andersen,1942