Malinowska, I., A. M. Dobosiewicz, Łucja Stalmirska, and E. Pankanin. “Adaptive Mechanisms of Cardiovascular System in Trained Athletes”. Journal of Education, Health and Sport, vol. 7, no. 12, Dec. 2017, pp. 378-85, https://apcz.umk.pl/JEHS/article/view/5213.