I.P. Zaitseva. “The Influence of Functional States on the Normative Indicators of Cross-Country Running of Students before and After the COVID-19 Pandemic”. Theory and Practice of Physical Culture, no. 4 (April 27, 2023): 57–59. Accessed February 2, 2025. http://tpf1610220.nichost.ru/index.php/TPPC/article/view/576.