Baum, Rafał, and Jerzy Bieńkowski. “Eco‑efficiency As Part of Sustainable Farm Development”. Acta Universitatis Lodziensis. Folia Oeconomica 2, no. 341 (July 3, 2019): 23–42. Accessed January 30, 2025. https://czasopisma.uni.lodz.pl/foe/article/view/3699.