00515naa#a2200181#i#450# EN\INFRA-M\bibl\6507 20250123072548.4 2308-4898 20150610b2015####ek#y0engy0150####ca RUS RU About the Tasks of Descriptive Geometry With Imaginary Solutions Journal article Moscow INFRA-M Academic Publishing LLC. 2015 5 с. Journal article local Ivanov G. Dmitrieva I. M. zh-szf.ru