00542naa#a2200169#i#450# EN\\bibl\4191 20241010094407.4 2308-8877 20141113b2014####ek#y0engy0150####ca RUS RU The structure of caustics beletsky equation Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2014 4 с. Journal article local Kostina T. naukaru.ru