Sheikh, S., V. V. Vaze, A. Bajaj, and B. . “Merits of Kerrisons Punch over Powered Drill in Endonasal DCR”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 5, no. 2, Feb. 2019, pp. 387-90, doi:10.18203/issn.2454-5929.ijohns20190766.