Bałandynowicz-Panfil, Katarzyna, et al. “COVID -19 Pandemic, Surveys on Elderly about Vaccination. National and European Perspectives”. Magyar Gerontológia, vol. 13, no. Kulonszam, Dec. 2021, pp. 14-17, https://doi.org/10.47225/mg/13/Kulonszam/10571.