Salmeron M, [Echoendoscopy and cancer of the rectum], in Ann Gastroenterol Hepatol (Paris), vol. 29, n. 3, maggio 1993, pp. 125-6, PMID8517626.
Jabbar AA, Efficacy of endorectal ultrasonography in preoperative staging of rectal carcinoma, in Saudi Med J, vol. 27, n. 11, novembre 2006, p. 1781, PMID17106571.
Reading CC, Endorectal sonography, in Crit Rev Diagn Imaging, vol. 33, n. 1-2, 1992, pp. 1-28, PMID1727038.