B. Timilsina, C. Agarwal, S. Adhikari, S. Agrawal, and R. Gupta, “Randomized Clinical Trial Comparing Botulinum Toxin Injection with Nitroglycerine Ointment for Treatment of Chronic Anal Fissure”, JBPKIHS, vol. 1, no. 2, pp. 88–94, Dec. 2018.