Клюс [Elena Klyus] Олена Анатоліївна. “The Dynamics of Task Performance Among Boys During Their Second Year of Studying at Educational Establishment”. Slobozhanskyi Herald of Science and Sport, no. 5(38) (December 30, 2013): 132–140. Accessed August 17, 2024. https://journals.uran.ua/index.php/1991-0177/article/view/20593.