Mathisen, Gunnar E., Rein M. Jensen, and Svein A. Pettersen. “Aerobic Games and Playful Exercises in 9-Year-Old Boys: Intensity and Fitness Effects”. Revija za elementarno izobraževanje 9, no. 1/2 (April 1, 2016): 57–64. Accessed February 19, 2026. https://journals.um.si/index.php/education/article/view/374.