Kotliar, Serhii, Oleksandr Toporkov, and Tetiana Sidorova. 2021. “Special Force Training of Qualified Cross-Country Skiers of 18-20 Years Old in the Preparatory Period”. Slobozhanskyi Herald of Science and Sport, no. 2(82) (May):37-43. https://doi.org/10.15391/snsv.2021-2.006.