1. An introduction to orthodontics;Mitchell,1996
2. Early treatment;Moyers,1988
3. A longitudinal radiographic study of the mineralization of 2nd premolars;Ravn;Scan J Dent Res,1977
4. Extraction of the deciduous second molar in hypodontia;Lindqvist;Eur J Orthod,1980
5. Restoration of an infra-occluded primary molar with an indirect composite onlay: a case report and literature review;Evans;Dental Update,1996