Radochońska, A., S. Dudzik, and L. Perenc. “The secular trend in physical development of the Rzeszów children in age group 7 to 14 years”. European Journal of Clinical and Experimental Medicine, vol. 3, no. 2, June 2005, pp. 113–120, https://journals.ur.edu.pl/ejcem/article/view/13467.