@article{Konopatskiy2022point,
author={Konopatskiy, E.V. and Bezditnyi, A.A.},
title={Point Tools of Geometric Modeling, Invariant Relating to Parallel Projection},
journal={Geometry & Graphics},
publisher={INFRA-M Academic Publishing LLC.},
year={2022},
pages={11-21},
volume={9},
issue={4},
}