Radziejowska, Maria. “Use of Physical Education Means in Younger School-Aged Pupils After Acute Seasonal Viral Infections of the Upper Respiratory Tract”. Journal of Education, Health and Sport 8, no. 2 (February 28, 2018): 407–421. Accessed May 17, 2025. https://apcz.umk.pl/JEHS/article/view/6321.