00578naa#a2200193#i#450# EN\INFRA-M\bibl\42407 20251231201901.3 2308-4898 20201230b2020####ek#y0engy0150####ca RU Descriptive Geometry Problems Visualization by Wolfram Mathematica Journal article Moscow INFRA-M Academic Publishing LLC. 2020 10 с. Journal article local Математика. 51 Ignat'ev S. A. Folomkin A. I. Muratbakeev E. H. zh-szf.ru