Redi E.V., and Ivashko N.V. “The Effect of Upstroke on Monofin Swimming Speed in Young Athletes in Underwater Sports”. Theory and Practice of Physical Culture, no. 11 (January 23, 2025): 6–7. Accessed March 10, 2025. http://tpf1610220.nichost.ru/index.php/TPPC/article/view/1157.