Anita Csiba, Árpád Ferencz. "THE COSTS AND RATE OF RETURN CALCULATION OF THE NEW ESTABLISHED PIG AND POULTRY MANURE FERMENTATION PLANT." SGEM International Multidisciplinary Scientific GeoConference- EXPO Proceedings; 23rd International Multidisciplinary Scientific GeoConference Proceedings SGEM 2023, Energy and Clean Technologies, Vol 23, Issue 4.2 (2023): 95-104. https://doi.org/10.5593/sgem2023v/4.2/s18.12