00604naa#a2200181#i#450# EN\\bibl\3207 /en/manage/index 20250214045846.5 2308-8877 20140617b2014####ek#y0engy0150####ca RUS RU Some theorems on vektor fields on surfaces in r3 Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2014 0 с. Journal article local Voskovskaya N. test.editorum.ru /en/manage/index