Horakova, M., and I. Vadovicova. “Determination of Predictive Factors of Choledocholithiasis in Cases of Acute Biliary Pancreatitis”. Communications - Scientific Letters of the University of Zilina, Vol. 13, no. 1, Mar. 2011, pp. 56-59, http://journals.uniza.sk/index.php/communications/article/view/809.