Pryimakov, O.O., D.P. Kyslenko, Y.O. Yukhno, and E. Eider. “Circular Training As a Means for Improving Physical Skills in Future Security Specialists in Higher Education Institutions of Ukraine”. Physical education of students 23, no. 5 (October 26, 2019): 262-268. Accessed January 27, 2022. https://sportedu.org.ua/index.php/PES/article/view/946.