M. Horvat, W. Piątek, L. Potěšil, and K. F. Rozsnyai, “Public Administration’s Adaptation to COVID-19 Pandemic – Czech, Hungarian, Polish and Slovak Experience”, CEPAR, vol. 19, no. 1, pp. 133–158, May 2021, doi: 10.17573/cepar.2021.1.06.