1. 1. Schlosser RJ, Woodworth BA. Chronic rhinosinusitis and polyposis. In: Snow B, Wackym PA. 17th edn. Ballenger's otorhinolaryngology. PMPH: USA 2008:573-83.
2. An analysis of the anatomic variations of the paranasal sinuses and ethmoid roof using computed tomography;Kaplanoglu;Eurasian J Med,2013
3. 3. Snow JB, Wackym PA, Ballenger JJ, et al. Ballenger's otorhinolaryngology head and neack surgery. 17th edn. London: BC Decker Inc 2009.
4. 4. Melhem ER, Oliverio PJ, Benson ML, et al. Optimal CT evaluation for functional endoscopic sinus surgery. Am J Neuroradiol 1996;17(1):181-8.
5. 5. Stammberger H, Posawetz W. Functional endoscopic sinus surgery. Concept, indicators and results of the Messerklinger technique. Eur Arch Otorhinolaryngol 1990;247(2):63-76.