Karło, A., B. Szmelcer, M. Kontowicz, P. Wszelaki, D. Zaborna, M. Wilczyński, N. Krakowska, A. Florczak, A. Modlińska, A. Zwolinski, K. Kwiatkowska, P. Piątkowska, and K. Kędziora-Kornatowska. “Degeneration of the Lumbar Intervertebral Discs As a Cause of Root Discomfort in the Lumbar Spine”. Journal of Education, Health and Sport, vol. 9, no. 8, Aug. 2019, pp. 343-55, https://apcz.umk.pl/JEHS/article/view/7319.