Huu Tri, Nguyen, Nguyen Quoc Tram, Trinh Thi Thanh Minh, and Nguyen Thanh Trung. “Unstructured Play With Active Equipment Enhances Moderate-to-Vigorous Physical Activity in Children”. SPORT TK-EuroAmerican Journal of Sport Sciences 15 (March 30, 2026): 18. Accessed September 12, 2026. https://revistas.um.es/sportk/article/view/627241.