Kouklakis, G., A. Gatopoulou, N. Lirantzopoulos, E. Efraimidou, and K. Manolas. “Evaluation of Guide Wire Cannulation Technique in Elderly Patients With Choledocholithiasis”. Journal of Gastrointestinal and Liver Diseases, vol. 18, no. 2, June 2009, pp. 185-8, https://www.jgld.ro/jgld/index.php/jgld/article/view/2009.2.9.