Близнюк [Yuriy Bliznyuk] Ю. В., and Ярёменко [T. Yaremenko] Т. В. “Physiological Features of Skilled Swimmers Who Specialize in Crawle Mode on the Chest”. Slobozhanskyi Herald of Science and Sport, no. 3(36), June 2013, pp. 53-57, https://journals.uran.ua/index.php/1991-0177/article/view/20482.