00487naa#a2200169#i#450# EN\INFRA-M\bibl\268 20260208203641.7 2308-4898 20130603b2013####ek#y0engy0150####ca RUS RU Descriptive geometry prospects as educational subject Journal article Moscow INFRA-M Academic Publishing LLC. 2013 1 с. Journal article local Ivanov Gennadiy Sergeevich naukaru.ru