1. Double primary teeth and their relationship with the permanent successors: a radiographic study of 376 cases;Yuen;Pediatr Dent,1987
2. Double teeth: review of the literature;Schuurs;ASDC J Dent Child,2000
3. Developmental abnormalities of the teeth and the jaws;Schulze,1970
4. Fusion of teeth;Mader;JADA,1979
5. Anomalous tooth development;Tannenbaum;Oral Surg Oral Med Oral Pathol Oral Radiol Endod,1963