1. Current concepts in anal fissures;Ayantunde;World J Surg,2006
2. The use of glyceryl trinitrate (gtn) in the treatment of chronic anal fissure in children;Simpson;Med Sci Mon Int Med J Exp Clin Res,2003
3. Ischaemic nature of anal fissure;Schouten;Br J Surg,1996
4. Nitric oxide deficiency in the internal anal sphincter of patients with chronic anal fissure;Lund;Int J Colorectal Dis,2006
5. Aetiology and treatment of anal fissure;Lund;Br J Surg,1996