1. Pathology of the Dental Hard Tissues;Pindborg,1970
2. Dens in Dente;Poyton;Dent. Radiogr. Photogr,1966
3. Dens in Dente;Shafer;N. Y. Dent. J,1953
4. Double Dens in Dente in a Single Tooth;Ulmansky;Oral Surg,1964
5. Dens Invaginatus. I. A Clinical, Roentgenological and Genetical Study of Permanent Upper Lateral Incisors;Grahnen;Odontol. Revy,1959