1. Socialstyrelsen, Medicinsk åldersutredning av invandrarbarn och adoptivbarn;SOSFS,1993
2. The accuracy and precision of the third molar as an indicator of chronological age;Thorsson;Swed. Dent. J.,1991
3. Third molar formation and its development course;Garn;Angle Orthod.,1962
4. Dental maturity in Finnish children, estimated from the development of seven permanent mandibular teeth;Nyström;Acta Odont. Scand.,1986
5. A new system of dental age assessment;Demirjian;Hum. Biol.,1973