Bengstrom, R.J., A study of the time of eruption and root development of the permanent teeth between six and thirteen years. Masters Thesis ( Northwestern Univ. Dental School, 1930).
Cohen, J.T., AND Anderson, J.E., Note on the eruption of the permanent teeth in a group of subnormal children, including an observation of the frequency of congenitally missing laterals . J. Genetic Psychology, 39: 279, 1931.
4.
Dolder, Statistical survey of the deficient dentition. (Cited by Thoma, p. 155.)
5.
Downs, W.G., Studies in the causes of dental anomalies. Genetics , 12: 570, 1927.
6.
Hrdlicka, A. , Further studies on tooth morphology. A. J. Physical Anthrop. , 4: 141, 1921.
7.
Lubner, B., A case of absence of permanent canines. Brit. D. J. , 62: 262, 1937 (cited by Thoma, p. 192).
8.
McCall, J.O., AND Samuels , I.M., Congenital absence of first permanent molars. D. Items of Interest, 65: 315, 1943 .
9.
Montagu, M.F.AsHLEY, The significance of the variability of the upper lateral incisor teeth in man. Human Biol., 12: 323, 1940.
10.
Oliver, C.P. , Brekhuss, P.J., AND Montelius , G.A., A genetic study of congenitally missing teeth. Proc. Minn. Acad. Sci. , 10: 9, 1942.
11.
Schultz, A.H. , The hereditary tendency to eliminate the upper lateral incisors. Human Biol. 4: 34, 1932.
12.
Schultz, A.H. , Inherited reductions in the dentition of man . Human Biol., 6: 627, 1934.
13.
Schweitzer, G., Deutsche Zahn., Mund. u. Kieferh., 1: 236, 1934 (cited by Thoma, p. 193).
14.
Thadani, K.I. , A toothless type of man. J. Heredity, 12: 87, 1921.