M. R. Joshi, T. P. Bohara, and S. Rupakheti, “Comparison of Fissure Healing and The Incidence of Headache Among the Patients Treated with Endo- and Perianal Application of 0.2% Glyceryl Trinitrate for Chronic Anal Fissure”, J Nepal Med Assoc, vol. 55, no. 204, pp. 45–50, Dec. 2016.