ÖZÜTEMİZ, A. Ömer, et al. “EFFECT OF DILTIAZEM ON INTERDIGESTIVE GALLBLADDER . VOLUME AND POSTPRANDIAL GALLBLADDER EMPTYING IN NORMAL SUBJECTS”. Turkish Journal of Gastroenterology, vol. 4, no. 2, Jan. 1993, pp. 279-83, https://www.turkjgastroenterol.org/index.php/tjg/article/view/293.