Firlej KA, Stanuch M. Forecasting the development of renewable energy sources in the Visegrad Group countries against the background of the European Union. IER [Internet]. 2022 Sep. 30 [cited 2024 Sep. 8];8(3):37-52. Available from: https://ier.uek.krakow.pl/index.php/pm/article/view/2086