Мных, А.С., Баташова, Н.А., Левченко, С.А. and Ерохин, Д.Е. 2010. The analyses of heating system economic efficiency with additional energy source. Eastern-European Journal of Enterprise Technologies. 6, 7(48) (Nov. 2010), 4–6. DOI:https://doi.org/10.15587/1729-4061.2010.3354.