00502naa#a2200169#i#450# EN\INFRA-M\bibl\51095 20250103043129.5 2308-4898 20220629b2022####ek#y0engy0150####ca RU A Systematic Approach to the Study of Descriptive Geometry Journal article Moscow INFRA-M Academic Publishing LLC. 2022 9 с. Journal article local Математика. 51 Sal'kov N. A. naukaru.ru