00629naa#a2200193#i#450# EN\\bibl\8023 20241114125419.4 2308-8877 20151105b2015####ek#y0engy0150####ca RUS RU Modelmathematical pendulum as the method of research clock accuracy Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2015 4 с. Journal article local Kireev N. Kumitskiy B. M. Cavrasova N. naukaru.ru