M. Stec, M. Grzebyk, W. Caputa, and I. Krawczyk-Sokołowska, “A comparative analysis of the level of sustainable development in Polish voivodeships in 2012 and 2021”, EiS, vol. 89, no. 2, p. 766, Jul. 2024, doi: 10.34659/eis.2024.89.2.766.