Voronkov, L., and N. Tkach. “SURVIVAL OF PATIENTS WITH CHRONICLE HEART FAILURE AND LEFT VENTRICLE SYSTOLIC DYSFUNCTION DEPENDING ON CLINICAL AND INSTRUMENTAL PARAMETRS (from Data of Three-Year Prospective Supervision)”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 15, 1, pp. 58-66, https://periodicals.karazin.ua/medicine/article/view/7009.