Veingerl, Bojan. “Early Postoperative Serum Carcinoembryonic Antigen Levels in Patients Operated for Colorectal Carcinoma - a New Method for Following-up”. Radiology and Oncology, vol. 37, no. 2, June 2003, https://www.radioloncol.com/index.php/ro/article/view/1368.