Rykała, J., S. Snela, J. Drzał-Grabiec, J. Podgórska, J. Nowicka, and W. Kosiba. “Evaluation parameters of longitudinal and transverse arches of the feet in both non-weight bearing and weight-bearing conditions in children aged from 7 to 10”. European Journal of Clinical and Experimental Medicine, vol. 11, no. 2, June 2013, pp. 183–193, https://journals.ur.edu.pl/ejcem/article/view/12679.