Ķīsis, Igors, and Nataļja Sitņika. “The Effect of Physical Activities on the Fitness Levels in Children With Developmental Problems Impaired Development”. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 2 (May 9, 2015): 299–307. Accessed March 11, 2026. https://archive-journals.rtu.lv/sie/article/view/737.