Szweda A. The importance of modernizations in realization of sustainable development principles – a case study of the Heating Plant ‘Piast’ in Bieruń, Poland. ees [Internet]. 2020 Nov. 20 [cited 2025 Apr. 10];18(1 (45):375-86. Available from: https://czasopisma.uni.opole.pl/index.php/ees/article/view/2619