%0 Journal Article %A X. Yi %A S. F. Kamornikov %A V. N. Tyutyanov %T One property of hereditary saturated formations %J Problemy fiziki, matematiki i tehniki %D 2021 %P 50-53 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PFMT_2021_1_a7/ %G ru %F PFMT_2021_1_a7