Yakar, Fatih, Ihsan Dogan, Onur Ozgural, Umit Eroglu, Suha Beton, and Agahan Unlu. 2017. “Subdural Empyema As a Rare Complication of Sinonasal Infection: A Case Report and Review of Literature”. International Surgery Journal 4 (10):3519-22. https://doi.org/10.18203/2349-2902.isj20174528.