%0 Journal Article %A I. V. Shragin %T Conditions for the convergence of superpositions %J Differencialʹnye uravneniâ %D 1977 %P 1900-1901 %V 13 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_10_a28/ %G ru %F DE_1977_13_10_a28