Drab, M., A. Szymczyk, W. Tomczak, E. Drab-Urbanek, K. Łapacz, M. Hus, and M. Podhorecka. “Chest Pain in the Course of Multiple Myeloma - a Clinical Case Study”. Journal of Education, Health and Sport, vol. 8, no. 7, May 2018, pp. 11-18, https://apcz.umk.pl/JEHS/article/view/5537.