Szweda, Anna. “The Importance of Modernizations in Realization of Sustainable Development Principles – a Case Study of the Heating Plant ‘Piast’ in Bieruń, Poland”. Economic and Environmental Studies 18, no. 1 (45) (November 20, 2020): 375–386. Accessed November 22, 2024. https://czasopisma.uni.opole.pl/index.php/ees/article/view/2619.