1. Study of the mandibular th ird molar area;Ledyard;Amer J Orthodont,1953
2. A study of growth potential; from observations made in over 50 years of orthodontic practice;McCoy;Amer J Orthodont,1965
3. Extraction in orthodontic treatment, Cases in which extraction of the four first bicuspids is advisable;Herzberg;Dent Clin N America,1960
4. Our third molar teeth, their eruption, presence and absence;Heilman;Dent Cosmos,1936
5. The development of the human dentition;Schour;JADA,1941