00447naa#a2200169#i#450# EN\INFRA-M\bibl\4998 20240425230419.4 2308-4898 20141210b2014####ek#y0engy0150####ca RUS RU Graphic Vector Calculus Journal article Moscow INFRA-M Academic Publishing LLC. 2014 3 с. Journal article local Savelev Yuriy riorpub.com