Stawicki , M. and Wojewódzka-Wiewiórska , A. 2023. Regional Differentiation of GDP at the NUTS-3 Level in Selected European Countries after their Accession to the European Union. Economy of Regions. 19, 4 (Dec. 2023), 1224–1236. DOI:https://doi.org/10.17059/ekon.reg.2023-4-20.