Fialko N., Prokopov V., Sherenkovskii J., Yevtushenko A., Polozenko N., Maletska O., Kyniak O., Novakovskiy M., Dashkovska I., Regragui A. Analysis of the use level of secondary energy resources in energy sector of Ukraine // International scientific journal "Internauka". — 2020. — №16. https://doi.org/10.25313/2520-2057-2020-16-6387