Geidel, Stephan, Michael Lass, and Jörg Ostermeyer. “Restrictive Mitral Valve Annuloplasty for Chronic Ischemic Mitral Regurgitation: A 5-Year Clinical Experience With the Physio Ring”. The Heart Surgery Forum 11, no. 4 (September 5, 2008): E225-E230. Accessed September 22, 2024. https://journal.hsforum.com/index.php/HSF/article/view/67.