GÜRBÜZ, A. Kemal, et al. “Gastric Emptying of Non Digestible Solid Radiopaque Markers and Autonomic Neuropathy in Chronic Liver Disease”. Turkish Journal of Gastroenterology, vol. 6, no. 1, Jan. 1995, pp. 15-20, https://www.turkjgastroenterol.org/index.php/tjg/article/view/560.