Vashlyaev, F.B, and I.R. Vashlyaeva. “Rating Physical Working Capacity Based on Respiratory Function”. Theory and Practice of Physical Culture, no. 11 (January 3, 2022): 12–14. Accessed February 2, 2025. http://tpf1610220.nichost.ru/index.php/TPPC/article/view/30.