Mokhnatyi, S. I., and O. M. Dovgan. “Prognostic Model of Surgical Treatment of Severe Mitral Regurgitation at Mitral Valve Prolapse”. Ukrainian Journal of Cardiovascular Surgery, no. 4 (37), Oct. 2019, pp. 28-35, doi:10.30702/ujcvs/19.3712/066028-035.