Frossard, JL, JHD Fasel, and CD Becker. “Vascular Invasion in Pancreatic Cancer: Evaluation of Endoscopic Ultrasonography, Computed Tomography, Ultrasonography, and Angiography”. Swiss Medical Weekly 137, no. 1920 (May 19, 2007): 286–291. Accessed April 23, 2024. https://smw.ch/index.php/smw/article/view/735.