Raheel Azhar, Aabya Salim, Raazia Ramzan, Areeba Mahmood, Saad Aslam, Sidra Riaz. “A Comparative Study of Lateral Sphincterotomy Vs Topical Application of Glyceryl Trinitrate 0.2% in the Treatment of Chronic Anal Fissure an Observational Study”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 11, Jan. 2023, p. 586, doi:10.53350/pjmhs20221611586.