1. Extraction of four second molars;Quinn;Angle Orthod,1985
2. Second molar extraction in orthodontic treatment;Liddle;Am J Orthod,1977
3. Third molar development following second molar extractions;Marceau;J Pedodontics,1983
4. The effect of different extraction sites upon incisor retraction;Williams;Am J Orthod,1976
5. The relative effect of the extraction of various teeth on the development of third molars;Richardson;Trans Eur Orthod Soc,1975