00506naa#a2200181#i#450# EN\INFRA-M\bibl\33629 20260406113341.1 2308-4898 20191202b2019####ek#y0engy0150####ca RUS RU Approximation of Linear Sets in the Plane Journal article Moscow INFRA-M Academic Publishing LLC. 2019 9 с. Journal article local Математика. 51 RUS Yurkov V. zh-szf.ru