00599naa#a2200193#i#450# EN\\bibl\5590 20240518115724.6 2311-8873 20150415b2015####ek#y0engy0150####ca RUS RU Problem of free oscillations CAR Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2015 6 с. Journal article local Venevitina S. S. Zenina V. Malykhin V vntv.editorum.ru