Bejer, Agnieszka. “Research Studies on Physical Development of Children and Adolescents in South-Eastern Poland on Turn of the XX and XXI Centuries”. European Journal of Clinical and Experimental Medicine 9, no. 1 (March 30, 2011): 10–24. Accessed May 16, 2026. https://journals.ur.edu.pl/ejcem/article/view/12970.