Хорошуха Михайло Федорович (Mykhailo Khoroshukha). “Spiritual and Salutary Effects of Tempering of Young Athletes by the Nature on the System of Porfiry Ivanov (as from the Twenty-Five Years of Experience of the Author)”. Slobozhanskyi Herald of Science and Sport, no. 6(50) (December 1, 2015): 182–187. Accessed April 23, 2024. https://journals.uran.ua/index.php/1991-0177/article/view/56789.