1. Oral Surgery;Mead,1954
2. The impacted lower third molar;Durbeck,1957
3. Incidence of impacted teeth, Int;Mead;J. Orthod.,1930
4. Our third molar teeth; their eruption presence and absence;Hellman;Dental Cosmos,1961
5. The incidence of impacted teeth;Kramer;J. Oral Surg.,1970