Aizen Tub, Bernardo, et al. “Gastrointestinal Bleeding of Hidden Origin Diagnostic Value of Jejunal Endoscopy”. Cirugía Del Uruguay, vol. 61, no. 5-6, Apr. 1991, pp. 180-2, https://replica-revista.scu.org.uy/index.php/cir_urug/article/view/4018.