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2. Anodontia;Werther;Am. J. Orthodontics & Oral Surg.,1939
3. A Study of Patterns and Combinations of Congenitally Missing Teeth in Man;Brekhus;J. D. Res.,1944
4. Significance of Variability of Upper Lateral Incisor Teeth;Ashley-Montague;Human Biol.,1940