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VAMBOL, Viola, KOWALCZYK-JUŚKO, Alina, JÓŹWIAKOWSKI, Krzysztof, MAZUR, Andrzej, VAMBOL, Sergij and KHAN, Nadeem A. Investigation in Techniques for Using Sewage Sludge as an Energy Feedstock: Poland’s Experience. Ecological Questions. Online. 3 October 2022. Vol. 34, no. 1, pp. 91-98. [Accessed 13 July 2024]. DOI 10.12775/EQ.2023.007.