Шевчук, Т. Я., and А. П. Романюк. “The Features of Vegetative Regulation of Heart in Athletes and Team Sports Athletes”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology» 260 (1): 187-193. Accessed May 4, 2024. https://periodicals.karazin.ua/biology/article/view/6604.