Isański, Jakub, Szymon Kupiński, Mateusz Leszkowicz, Wojciech Andrzejewski, and Adam Bykowski. “Outdoor Fitness Activity under COVID-19 Restrictions. Wearable Devices, Images, and Posts As Sources of Information on Users”. Człowiek i Społeczeństwo 55 (July 19, 2023): 115–139. Accessed July 18, 2024. https://pressto.amu.edu.pl/index.php/cis/article/view/38856.