00491naa#a2200169#i#450# EN\INFRA-M\bibl\47425 20250120223538.1 2308-4898 20211209b2021####ek#y0engy0150####ca RU The Origins of Formation of Descriptive Geometry Journal article Moscow INFRA-M Academic Publishing LLC. 2021 8 с. Journal article local Математика. 51 Sal'kov N. A. zh-szf.ru