Хорошуха Михайло Федорович (Mykhailo K. 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, [S. l.], n. 6(50), p. 182–187, 2015. DOI: 10.15391/snsv.2015-6.034. Disponível em: https://journals.uran.ua/index.php/1991-0177/article/view/56789. Acesso em: 23 apr. 2024.