S. Gomulka, “Poland's Transformation : Facts and Myths about the Period 1990-2020 and the Country's Chances of Attaining the Economic Level of the USA and Germany after 2020”, DEM, vol. 5, no. 2, pp. 41–65, Dec. 2020, Accessed: Sep. 12, 2025. [Online]. Available: https://ojs.fimagis.pl/index.php/demo/article/view/1185