Zaitsev, L., M. Mishyn, and S. Lebediev. “Development of Speed Abilities of Players of the Age Category U-15 During the Macrocycle in Futsal”. Journal of Learning Theory and Methodology, vol. 6, no. 2, Aug. 2025, pp. 80-85, doi:10.17309/jltm.2025.6.2.03.