1. The permanent first molar: its calcification, eruption and decay;Gleiser;Am J Phys Anthropol,1955
2. Tooth formation age estimated on a few selected teeth. A simple method for clinical use;Häävikko;Proc Finn Dent Soc,1974
3. A new system of dental age assessment;Demirjian;Hum Biol,1973
4. The study of tooth-developmental age of Thai children in Bangkok;Raungpaka;J Dent Assoc Thailand,1988
5. Age estimation up to 16 years of age based on dental development;Gustafson;Odontol Rev,1974