1. American Academy of Pediatric Dentistry. Reference manual: Guideline management of the developing dentition and occlusion in pediatric dentistry, http://www.aapd.org/media/Policies_Guidelines/G_DevelopDentition.pdf, accessed September 1 2014.
2. Orthodontic treatment in the primary dentition;Ngan;J Am Dent Assoc,1988
3. Handbook of Orthodontics;Moyers,1988
4. Physiological tooth migration and its significance for the development of occlusion;Baume;J Dent Res 29,1950
5. Growth changes of the dental arches: a longitudinal study;Moorrees;J Can Dent Assoc,1958