Smartphones in sports and physical activities of adolescents

Adamčák, Štefan, 1971-

Smartphones in sports and physical activities of adolescents / Štefan Adamčák, Pavol Bartík ; rec. Jaromír Šimonek, Josef Oborný. -- 1. vyd. -- Poznaň : Wyższa Szkoła Uni Terra w Poznaniu, 2021. -- 111 s.