1. The beauty of the face: an orthodontic perspective;Dierkes;J Am Dent Assoc,1987
2. Some aspects of the retraction of upper incisors by appliances;Breakspear,1963
3. The deviated midline;Lewis;Am J Orthod,1976
4. Posterior crossbites—recognition, evaluation and treatment;Borell;State Dent J,1982
5. Current orthodontic concepts and techniques;Graber,1975