Krawczyk, Marcin, and Mariusz Pociecha. “INFLUENCE OF A 6-WEEK MIXED BALLISTIC-PLYOMETRIC TRAINING ON THE LEVEL OF SELECTED STRENGTH AND SPEED INDICES OF THE LOWER LIMBS IN YOUNG FOOTBALL PLAYERS”. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 4 (May 21, 2019): 198–206. Accessed November 24, 2024. https://journals.ru.lv/index.php/SIE/article/view/3718.