Smith, W. K., and H. K. Subrahmanyam. “Dual Cholesteatoma in a Non-Operated Ear: A Rare Presentation”. Asian Journal of Case Reports in Medicine and Health, Vol. 3, no. 2, May 2020, pp. 8-12, http://journalajcrmh.com/index.php/AJCRMH/article/view/30124.