Stepanova, A. “ANALYSIS OF THE APPLICATION COMBINED HEAT RECOVERY SYSTEMS FOR WATER HEATING AND BLAST AIR OF THE BOILER UNIT”. Thermophysics and Thermal Power Engineering 38, no. 4 (August 20, 2016): 38-46. Accessed January 29, 2022. http://ihe.nas.gov.ua/index.php/journal/article/view/253.