Smartphone screen time and physical activity in a sample of Czech and Slovak secondary school male students

ADAMČÁK, Štefan - MARKO, Michal - GÖRNER, Karol. Smartphone screen time and physical activity in a sample of Czech and Slovak secondary school male students. In Sport i turystyka : środkowoeuropejskie czasopismo naukowe. - Čenstochová : Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza, 2023. ISSN 2545-3211, 2023, vol. 6, no. 4, pp. 93-107. Dostupné na: https://doi.org/10.16926/sit.2023.04.05.