Perineal colostomy and electrostimulated gracilis “neosphincter” after abdomino-perineal resection of the colon and anorectum: a surgical experience and follow-up study in 47 cases - Cavina,E.; Seccia,M.; Evangelista,G.; Chiarugi,M.; Buccianti,P.; Tortora,A.; Chirico,A. (Int J Colorectal Dis, 1990)