1. Subcutaneous Emphysema Caused by Air-Insufflation Through Root Canal;Glahn;Tandlægebladet,1949
2. Emphysema;Køie;Tandlægebladet,1935
3. Orbital Emphysema Following Fracture of the Nasal Sinuses;Murray;J. Fac. Radiologists,1949
4. An Unusual Dental Accident;Sherman;Oral Surg., Oral Med., and Oral Path,1954