Świątkowski, W., M. Rahnama, K. Wieczorek, I. Jastrzębska-Jamrogiewicz, and R. Jamrogiewicz. “Displacement of Fractured Root Canal Instrument in the Space of Floor of Mouth”. Journal of Education, Health and Sport, vol. 8, no. 3, Mar. 2018, pp. 193-9, https://apcz.umk.pl/JEHS/article/view/5342.