ÖKTEN, Atilla, et al. “SPONTANEOUS PORTOSYSTEMIC SHUNTS: RELATIONSHIP TO UPPER GASTROINTESTINAL BLEEDING AND HEPATIC ENCEPHALOPATHY”. Turkish Journal of Gastroenterology, vol. 3, no. 4, Jan. 1992, pp. 591-6, https://www.turkjgastroenterol.org/index.php/tjg/article/view/211.