S., C., N., A., Ireddy, V.K., Patil, V.K. and Prabhu, R. 2017. Efficacy of closed internal sphincterotomy using von grafae knife in the management of chronic anal fissures. International Surgery Journal. 4, 5 (Apr. 2017), 1532–1535. DOI:https://doi.org/10.18203/2349-2902.isj20171590.