Nikiforova, O.N., E.V. Markin, and A.A. Soparev. “Developing the Physical Fitness of Volleyball Players Using Modern Training Equipment”. Theory and Practice of Physical Culture, no. 11 (December 12, 2025): 14–17. Accessed December 15, 2025. http://tpfk.ru/index.php/TPPC/article/view/1498.