Tomanek, Mateusz, and Andrzej Lis. “Physical Activity in the Context of the COVID-19 Pandemic: Research Profiling and Mapping”. Physical Education of Students 25, no. 3 (June 30, 2021): 136–148. Accessed July 17, 2026. https://sportedu.org.ua/index.php/PES/article/view/1434.