Schmitz, C., O. Ashraf, D. Bimmel, and A. Welz. “Direct Aortic Cannulation in Minimally Invasive Mitral-Valve Operations”. The Heart Surgery Forum 5, no. 4 (December 1, 2002): E370-E372. Accessed February 19, 2025. https://journal.hsforum.com/index.php/HSF/article/view/6047.