Popov, V. V., BolshakА. А., and V. V. Lazoryshynets. “Оperation «labyrinth» in Surgical Treatment of Combined Mitral-аоrtic Failures”. Klinicheskaia khirurgiia 87, no. 7-8 (September 30, 2020): 25-28. Accessed March 8, 2021. https://hirurgiya.com.ua/index.php/journal/article/view/843.