Chrisanthus, J., and S. George. “Mastoidectomy: Retrospective Analysis of 137 Cases in a Tertiary Care Hospital”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 4, no. 1, Dec. 2017, pp. 93-99, doi:10.18203/issn.2454-5929.ijohns20174662.