Sychov, O.S. et al. 2017. INFLUENCE OF THE HEART RATE ON THE QUALITY OF LIFE AND SEVERITY OF ARRHYTHMIA SYMPTOMS IN PATIENTS WITH A PERMANENT ATRIAL FIBRILLATION NON-VALVULAR ETIOLOGY. Bulletin of Scientific Research. 3 (Nov. 2017). DOI:https://doi.org/10.11603/2415-8798.2017.3.8081.