00568naa#a2200169#i#450# EN\\bibl\4395 20241218232656.3 2308-8877 20141207b2014####ek#y0engy0150####ca RUS RU Features free and compelled fluctuations of mechanical systems Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2014 3 с. Journal article local Belyaev Aleksandr zh-szf.ru