%0 Journal Article %A V. A. Ternovskiy %T Closedness of basis surfaces invariant with respect to the group $H_3$ %J Taurida Journal of Computer Science Theory and Mathematics %D 2022 %P 96-102 %N 2 %U http://geodesic.mathdoc.fr/item/TVIM_2022_2_a6/ %G ru %F TVIM_2022_2_a6