Shlyk, N.I. (2021) 2022. “STANDRDS FOR VARIATION RANGE OF RR-INTERVALS AT REST AND IN ORTHOSTASIS IN TRAINING OF RACING SKIERS WITH DIFFERENT TYPES OF REGULATION”. Theory and Practice of Physical Culture, no. 12 (January):30-34. http://tpfk.ru/index.php/TPPC/article/view/76.