Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) M J Notaras,The treatment of anal fissure by lateral subcutaneous internal sphincterotomy—A technique and results,British Journal of Surgery,0007-1323,Oxford University Press (OUP),1971-02,58,2,96-100,https://cir.nii.ac.jp/crid/1360855569129003776,https://doi.org/10.1002/bjs.1800580204