1. The straight wire appliance. Syllabus of philosophy and techniques. techniques;Andrews LF,1975
2. Effect of upper premolar extractions on the position of the upper lip;Bokas J;Aust Orthod J,2006
3. A treatment method for Class II Division 1 patients with extraction of permanent maxillary first molars;Booij JW;World J Orthod,2009
4. The geometry of Class II correction with extractions;Bryk C;J Clin Orthod,2001
5. Success rate and efficiency of activator treatment;Casutt C;Eur J Orthod,2007