Popovic D. Jasna, Popovic D. Milos, Popovic Ilic P. Tatjana, Miletic K. Vladimir, Purenovic-Ivanovic M. Tijana, and Popovic M. Ruzena, “Summer Outdoor Activities and Their Effects on Health Status in Physical Education Students: Gender Differences”, RUDHR-V3, pp. 1–23, Feb. 2024.