Natalia Iwaszczuk, Marta Szyba, Myroslava Mylenka 2019. USING ALTERNATIVE SOURCES OF METHANE FOR ENERGY AS A METHOD OF ENVIRONMENTAL PROTECTION AND IMPROVEMENT OF ECONOMY CONDITION, ON EXAMPLE OF POLAND. ACTA INNOVATIONS. 33, (Dec. 2019), 90–99. DOI:https://doi.org/10.62441/actainnovations.v33i.202.