SRITHARAN, H.; ASHOK KUMAR, N. K.; SYED IBRAHIM M. S., M. I. Single centre randomized comparative trial of lateral internal sphincterotomy versus 2% diltiazem in chronic anal fissure. International Surgery Journal, [S. l.], v. 7, n. 6, p. 1723–1727, 2020. DOI: 10.18203/2349-2902.isj20202089. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/5798. Acesso em: 8 nov. 2025.