Brown CJ, Dubreuil D, Santoro L, Liu M, O'Connor BI, McLeod RS (April 2007). "Lateral internal sphincterotomy is superior to topical nitroglycerin for healing chronic anal fissure and does not compromise long-term fecal continence: six-year follow-up of a multicenter, randomized, controlled trial". Dis. Colon Rectum. 50 (4): 442–8. doi:10.1007/s10350-006-0844-3. PMID17297553. S2CID24579316.
Keighley MR, Greca F, Nevah E, Hares M, Alexander-Williams J (June 1981). "Treatment of anal fissure by lateral subcutaneous sphincterotomy should be under general anaesthesia". Br J Surg. 68 (6): 400–1. doi:10.1002/bjs.1800680611. PMID7016242. S2CID40048690.
Brown CJ, Dubreuil D, Santoro L, Liu M, O'Connor BI, McLeod RS (April 2007). "Lateral internal sphincterotomy is superior to topical nitroglycerin for healing chronic anal fissure and does not compromise long-term fecal continence: six-year follow-up of a multicenter, randomized, controlled trial". Dis. Colon Rectum. 50 (4): 442–8. doi:10.1007/s10350-006-0844-3. PMID17297553. S2CID24579316.
Keighley MR, Greca F, Nevah E, Hares M, Alexander-Williams J (June 1981). "Treatment of anal fissure by lateral subcutaneous sphincterotomy should be under general anaesthesia". Br J Surg. 68 (6): 400–1. doi:10.1002/bjs.1800680611. PMID7016242. S2CID40048690.
Brown CJ, Dubreuil D, Santoro L, Liu M, O'Connor BI, McLeod RS (April 2007). "Lateral internal sphincterotomy is superior to topical nitroglycerin for healing chronic anal fissure and does not compromise long-term fecal continence: six-year follow-up of a multicenter, randomized, controlled trial". Dis. Colon Rectum. 50 (4): 442–8. doi:10.1007/s10350-006-0844-3. PMID17297553. S2CID24579316.
Keighley MR, Greca F, Nevah E, Hares M, Alexander-Williams J (June 1981). "Treatment of anal fissure by lateral subcutaneous sphincterotomy should be under general anaesthesia". Br J Surg. 68 (6): 400–1. doi:10.1002/bjs.1800680611. PMID7016242. S2CID40048690.