Политько, Елена. “Model Characteristics of Physical Development and Special Physical Preparedness of Swimmers 12–15 Years Old”. Slobozhanskyi Herald of Science and Sport, no. 2(64) (April 30, 2018): 45–49. Accessed November 24, 2024. https://journals.uran.ua/index.php/1991-0177/article/view/129837.