Федоров, С. В., et al. “THE EFFECT OF IVABRADINE AND OMEGA-3 POLYUNSATURATED FATTY ACIDS FOR QUALITY OF LIFE OF PATIENTS WITH HEART FAILURE”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY Pulse, no. 4(28), July 2019, pp. 39-44, https://pvntsh.nung.edu.ua/index.php/pulse/article/view/803.