HILCHENKO, A. . A systematic observation method for evaluating the effectiveness of defensive actions in volleyball. Theory and Practice of Physical Culture, [S. l.], n. 1, p. 33–35, 2026. Disponível em: http://tpf1610220.nichost.ru/index.php/TPPC/article/view/1563. Acesso em: 4 feb. 2026.