00568naa#a2200169#i#450# EN\\bibl\3774 20260313123719.5 2308-8877 20141105b2014####ek#y0engy0150####ca RUS RU REGENERATIVE AIRHEATER FOR PACKAGE BOILERS OF SMALL PRODUCTIVITY Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2014 2 с. Journal article local Zolina L. anni.editorum.ru