Mrozkowiak, Mirosław, et al. “The Incidence of Significant Relationships Between Selected Parameters of Feet and Parameters of Trunk in Adolescents Aged 14-18 Years”. Journal of Education, Health and Sport, vol. 8, no. 2, Feb. 2018, pp. 305-19, https://apcz.umk.pl/JEHS/article/view/5331.