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7. Empyema of the sphenoidal sinus. A case report. Claassen AJ S Afr J Surg; 1983 Mar; 21(1):55-60. PubMed ID: 6879353 [No Abstract] [Full Text] [Related]
8. [Endoscopy of the frontal sinus--preliminary report]. Görisch I; Oeken FW Z Arztl Fortbild (Jena); 1980 Aug; 74(15):716-7. PubMed ID: 7445546 [No Abstract] [Full Text] [Related]
9. Endoscopic sinus surgery for 'sinus headache'. Phillips JS; Vowler SL; Salam MA Rhinology; 2007 Mar; 45(1):14-9. PubMed ID: 17432063 [TBL] [Abstract][Full Text] [Related]