S. Vălean, P. Armean, S. Resteman, G. Nagy, A. Mureşan, and P. A. Mircea, “Cancer Mortality in Romania, 1955-2004. Digestive Sites: Esophagus, Stomach, Colon and Rectum, Pancreas, Liver, Gallbladder and Biliary Tree”, JGLD, vol. 17, no. 1, pp. 9–14, Mar. 2008.