Grzebyk, Mariola, and Małgorzata Stec. “The Level of Renewable Energy Used in EU Member States - A Multidimensional Comparative Analysis ”. Economics and Environment 86, no. 3 (December 22, 2023): 244–264. Accessed October 8, 2024. https://www.ekonomiaisrodowisko.pl/journal/article/view/558.