V.F. Lutkov, L.L. Miller, G.I. Smirnov, and D.I. Shadrin. “Modern Approach in Functional Assessment of Adaptation of Athletes With Heart Rhythm Disorders”. Theory and Practice of Physical Culture, no. 5 (July 8, 2023): 13–16. Accessed July 22, 2024. http://tpfk.ru/index.php/TPPC/article/view/599.