%0 Journal Article %A Nurlan D. Markhabatov %T Approximations of acyclic graphs %J The Bulletin of Irkutsk State University. Series Mathematics %D 2022 %P 104-111 %V 40 %U http://geodesic.mathdoc.fr/item/IIGUM_2022_40_a7/ %G en %F IIGUM_2022_40_a7