Rudenko, S. A., A. V. Rudenko, Yu. V. Kaschenko, and V. P. Zakharova. “Surgical Treatment of the Ischemic Heart Disease With Lowered Contractility of Left Ventricle and Mitral Valve Insufficiency”. Klinicheskaia khirurgiia 87, no. 9-10 (October 29, 2020): 22-26. Accessed May 9, 2021. https://hirurgiya.com.ua/index.php/journal/article/view/860.