Линець [Mykhaylo Lynets] М. М., Трохимчук [Nazar Trokhymchuk] Н. А., and Войтович [Ivan Voytovych] І. П. “Effectively Relevant Varieties of the Physical Qualities of Football (soccer) Players at the Stage of Specialized Basic Training”. Slobozhanskyi Herald of Science and Sport, no. 5(38), Dec. 2013, pp. 155-9, https://journals.uran.ua/index.php/1991-0177/article/view/20602.