Varma, A., and A. Sahni. “Transcanal Endoscopic Management of Epitympanic Cholesteatoma: A Promising Technique”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 5, no. 3, Apr. 2019, pp. 573-6, doi:10.18203/issn.2454-5929.ijohns20190987.