1. The development of orthodontic problems;Proffit,1997
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3. Supernumerary and congenitally missing primary teeth in Finnish children;Jarvin;Acta Odontol Scand,1981
4. Dental variations among populations;Bailit;Dent Clin North Am,1975
5. Studies of permanent tooth anomalies in 7886 Canadian individuals;Shah;J Can Dent Assoc,1978