1. The transfacial access to the retro-maxillary area;Altemir;J Maxillofac Surg,1986
2. Open-door max-illotomy approach for lesions of the clivus;Anand;Skull Base Surgery,1991
3. Transfacial exposure of anterior cranial fossa and clival tumors;Beals;Barrow Neurological Institute Quarterly,1992
4. Classification of transfacial approaches in the treatment of tumors of the anterior skull base and clivus;Beals;Plast Surg Forum,1993
5. Beals SP, Joganic EF, Hamilton MG, et al: Classification of transfacial approaches in the treatment of tumors of the anterior skull base and clivus. In Ortiz Monasterio F (ed): Craniofacial Surgery: Proceedings of the 5th International Society of Craniofacial Surgeons, 1994