Varshney, P. M., M. S. Ray, T. Nagyan, S. S. Malhi, D. H. Thakore, N. A. Modi, and S. Gupta. “Comparative Study of Unilateral Subcutaneous Internal Anal Sphincterotomy and 02% Diltiazem Local Application in Acute Fissure in Ano: A Study of 40 Patients over 01 Year”. International Surgery Journal, vol. 8, no. 2, Jan. 2021, pp. 530-5, doi:10.18203/2349-2902.isj20210362.