Коновалов [V. Konovalov] В. В., Касьян [A. Kas’an] А. В., & Череднiченко [A. Cherednichenko] А. В. (2013). Optimal physical activity of students in the initial period of training. Slobozhanskyi Herald of Science and Sport, (3(36), 16–19. Retrieved from https://journals.uran.ua/index.php/1991-0177/article/view/20457