00598naa#a2200169#i#450# EN\\bibl\3217 20240709035501.2 2308-8877 20140617b2014####ek#y0engy0150####ca RUS RU Rotation on the boundary of multiply connected region and the singular points of vector fields Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2014 2 с. Journal article local Shcherbakova K. zh-szf.ru