Zanghì, G., et al. “SURGICAL TREATMENT OF MUCOSAL HEMORRHOIDAL PROLAPSE USING A CIRCULAR STAPLER”. Annali Italiani Di Chirurgia, vol. 74, no. 1, Jan. 2003, pp. 63-66, https://annaliitalianidichirurgia.it/index.php/aic/article/view/1087.