Штих [Shtykh V.] В. А.; Сігал [Sigal N.] Н. С. Approach to the classification of olympic sports on objective criteria in determining the degree of their extremal. Slobozhanskyi Herald of Science and Sport, [S. l.], n. 4(31), p. 162–165, 2012. Disponível em: https://journals.uran.ua/index.php/1991-0177/article/view/21962. Acesso em: 23 dec. 2024.