1. A textbook of oral pathology;Shafer,1974
2. The permanent maxillary lateral incisor;Atkinson;Am J Orthod,1943
3. Dens in dente: report of three cases;Boyne;JADA,1952
4. The incidence, nature, and clinical significance of palatal invaginations in the maxillary incisor teeth;Hallett;Proc R Soc Med,1953
5. The diagnosis, clinical significance and treatment of minor palatal invaginations in maxillary incisors;Stephens;Proc R Soc Med,1953