Galeev, A.R., L.N. Igisheva, and E.M. Kazin. 1. “HEALTHY CHILDREN FROM 6 TO 16 YEARS’ HEART RATE VARIABILITY”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 3 (1), 35-40. https://periodicals.karazin.ua/medicine/article/view/7376.