Марченко, С., and В. Голубов. 2015. “Peculiarities of Game Modes Effect on Dynamics of Speed Development in Boys of Primary School Age”. Teorìâ Ta Metodika Fìzičnogo Vihovannâ, no. 4 (December), 17-24. https://doi.org/10.17309/tmfv.2015.4.1152.