GRACZYK, Andrzej, and Zbigniew Jakubczyk. “INVESTMENTS IN ENYIRONMENTAL PROJECTS AS AN ELEMENT OF A POLICY FOR SUSTAINABLE DEVELOPMENT IN THE REGION OF OPOLE IN 1993-2004 - FROM A STRUCTURAL POINT OF YIEW”. Economic and Environmental Studies 8 (December 14, 2020): 229–243. Accessed November 22, 2024. https://czasopisma.uni.opole.pl/index.php/ees/article/view/3037.