A. Bem, P. Prędkiewicz, R. Siedlecki, P. Ucieklak-Jeż, and J. Žukovskis, “Next Pandemic? Yes, Please! How Covid-19 Pandemic Improved the Financial Condition of Polish Hospitals”, JoFFL, no. 1, pp. 71–88, Dec. 2023, doi: 10.18778/2391-6478.S1.2023.04.