Marchenko, Svitlana, and Vladislav Riyaka. “Research of Reliability and Informativeness of Indicators of Muscular Fitness of Karate Boys Aged 8 Years”. Journal of Learning Theory and Methodology 4, no. 3 (November 30, 2023): 81–87. Accessed June 26, 2026. https://ltmjournal.com/e/article/view/77.