Стецькович [Stetskovych S.] С., Пітин [Pityn M.] М., and Хитров [Hitrov E.] Є. “Pentathlon Athletes Training Trends in Swimming Discipline in Accordance With the Competition Rules Changes”. Slobozhanskyi Herald of Science and Sport, no. 4(31), Oct. 2012, pp. 80-83, https://journals.uran.ua/index.php/1991-0177/article/view/21937.