Financing pro-ecological investments in the Częstochowa municipal enterprise Magdalena Wrońska, Anna Kwarciak-Kozłowska, Katarzyna Długosz and Monika Galwa-Widera E3S Web Conf., 46 (2018) 00022 Published online: 13 September 2018 DOI: 10.1051/e3sconf/20184600022