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2. Pneumomediastinum associated with zygomatico-maxillary fracture;Switzer;J Can Assoc Radiol,1974
3. Subcutaneous and mediastinal emphysema after oral surgery. Report of a case;Kleinman;J Oral Surg,1961
4. Mediastinal emphysema following tooth extraction;Marlett;Oral Surg,1963
5. Mediastinal emphysema after oral surgery;Meyerhoff;J Oral Surg,1979