A. Manowska, B. Bluszcz (2021). PRIMARY AND FINAL ENERGY MIX AND ENERGY EFFICIENCY. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Nano, Bio, Green and Space: Technologies for Sustainable Future, 197-204. https://doi.org/10.5593/sgem2021v/6.2/s27.29