%0 Journal Article
%T New Problems of Descriptive Geometry
%A Girsh, A.G.
%K analytical figure, synthetic figure, imaginary sphere, imaginary cylinder, degenerated surfaces, null sphere, null cylinder, imaginary complement, isotropes, contact, intersection, 4D figures
%J Geometry & Graphics
%D 2019
%N 7
%P 15
%I INFRA-M Academic Publishing LLC.