Rybchynskyi, S. V., Brynza, M. S., Volkov, D. Y. and Yabluchanskyi, M. I. (2018) “The electrical axis of the heart in patients with atrial fibrillation before and after radiofrequency ablation”, Zaporozhye Medical Journal, (5). doi: 10.14739/2310-1210.2018.5.141643.