00549naa#a2200181#i#450# EN\\bibl\68729 20241122162504.5 2307-7476 20170625b2017####ek#y0engy0150####ca RUS RU MECHANICS OF OSCILLATIONS IN DIFFERENTIAL EQUATIONS Journal article Saint-Petersburg Saint-Petersburg University of State Fire Service of Emercom of Russia 2017 3 с. Journal article local Moroz N A Shiroukhov A V journals.igps.ru