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Nelson RL, Thomas K, Morgan J, Jones A (2012). «Non surgical therapy for anal fissure». Cochrane Database of Systematic Reviews. 2: CD003431. doi:10.1002/14651858.CD003431.pub3. PMID22336789.
Shao, WJ; Li, GC; Zhang, ZK (2009 թ․ սեպտեմբեր). «Systematic review and meta-analysis of randomized controlled trials comparing botulinum toxin injection with lateral internal sphincterotomy for chronic anal fissure». International journal of colorectal disease. 24 (9): 995–1000. doi:10.1007/s00384-009-0683-5. PMID19266207.
Garg P, Garg M, Menon GR (2013 թ․ մարտ). «Long-term continence disturbance after lateral internal sphincterotomy for chronic anal fissure: a systematic review and meta-analysis». Colorectal Dis. 15 (3): e104–17. doi:10.1111/codi.12108. PMID23320551.
Yucel, T.; Gonullu, D.; Oncu, M.; Koksoy, F. N.; Ozkan, S. G.; Aycan, O. (2009 թ․ հունիս). «Comparison of Controlled-intermittent Anal Dilatation and Lateral Internal Sphincterotomy in the Treatment of Chronic Anal Fissures: A Prospective, Randomized Study». International Journal of Surgery. 7 (3): 228–231. doi:10.1016/j.ijsu.2009.03.006. PMID19361582.
Collins, E. E.; Lund, J. N. (2007 թ․ սեպտեմբեր). «A Review of Chronic Anal Fissure Management». Techniques in Coloproctology. 11 (3): 209–223. doi:10.1007/s10151-007-0355-9. PMID17676270.
Nelson RL, Thomas K, Morgan J, Jones A (2012). «Non surgical therapy for anal fissure». Cochrane Database of Systematic Reviews. 2: CD003431. doi:10.1002/14651858.CD003431.pub3. PMID22336789.
Haq., Z.; Rahman, M.; Chowdhury, R.; Baten, M.; Khatun, M. (2005). «Chemical Sphincterotomy—First Line of Treatment for Chronic Anal Fissure». Mymensingh Medical Journal. 14 (1): 88–90. PMID15695964.
Shao, WJ; Li, GC; Zhang, ZK (2009 թ․ սեպտեմբեր). «Systematic review and meta-analysis of randomized controlled trials comparing botulinum toxin injection with lateral internal sphincterotomy for chronic anal fissure». International journal of colorectal disease. 24 (9): 995–1000. doi:10.1007/s00384-009-0683-5. PMID19266207.
Garg P, Garg M, Menon GR (2013 թ․ մարտ). «Long-term continence disturbance after lateral internal sphincterotomy for chronic anal fissure: a systematic review and meta-analysis». Colorectal Dis. 15 (3): e104–17. doi:10.1111/codi.12108. PMID23320551.
Yucel, T.; Gonullu, D.; Oncu, M.; Koksoy, F. N.; Ozkan, S. G.; Aycan, O. (2009 թ․ հունիս). «Comparison of Controlled-intermittent Anal Dilatation and Lateral Internal Sphincterotomy in the Treatment of Chronic Anal Fissures: A Prospective, Randomized Study». International Journal of Surgery. 7 (3): 228–231. doi:10.1016/j.ijsu.2009.03.006. PMID19361582.