Fialko, N., StepanovаА., R. Navrodskaya, and M. Novakovskiy. “ANALYSIS OF THE EFFICIENCY OF THE BOILER PLANT WITH COMBINED HEAT RECOVERY SYSTEM UNDER DIFFERENT OPERATING CONDITIONS BOILER”. Thermophysics and Thermal Power Engineering, Vol. 39, no. 1, Feb. 2017, pp. 33-40, doi:https://doi.org/10.31472/ihe.1.2017.05.