Stec, Małgorzata, Mariola Grzebyk, Wiesława Caputa, and Pavlina Hejdukova. “Levels of Renewable Energy Use in Selected European Union Countries – Statistical Assessment of Changes and Prospects for Development”. Comparative Economic Research. Central and Eastern Europe 27, no. 3 (September 30, 2024): 117–140. Accessed December 8, 2025. https://www.czasopisma.uni.lodz.pl/CER/article/view/23856.