pid type title authors mentors source_title published_date url doi isbn issn eissn kif:1615 dissertation "Utjecaj učenja na daljinu i unaprjeđenja tjelesne pismenosti na promjene stanja fitnesa i tjelesne aktivnosti adolescenata" "Šunda, Mirela" kif:819 dissertation "Patterns of physical activity during secondary school" "Štefan, Lovro"