Povetkina, T. M., E. A. Gozhenko, and W. Zukow. “Heart Rate Variability As a Marker of Term Adaptation Mechanisms in Predicting an Individual Adaptation to the Balneotherapy”. Journal of Education, Health and Sport, vol. 5, no. 1, Jan. 2015, pp. 249-62, https://apcz.umk.pl/JEHS/article/view/3020.