Litak, J., A. Szudy-Szczyrek, C. Grochowski, W. Janusz, P. Kamieniak, K. Kot-Bakiera, and D. Szczepanek. “Spinal Manifestation of Multiple Myeloma - Case Report”. Journal of Education, Health and Sport, vol. 7, no. 3, Feb. 2017, pp. 332-40, https://apcz.umk.pl/JEHS/article/view/4283.