00607naa#a2200181#i#450# EN\\bibl\3219 20241128121327.4 2308-8877 20140617b2014####ek#y0engy0150####ca RUS RU Differential equations for calculating the time of reformation multi raft 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 Chetverikova I. Skripets A. naukaru.ru