%0 Journal Article %A I. Zeman %T A remark on Tihonov's theorem %J Differencialʹnye uravneniâ %D 1971 %P 2187-2190 %V 7 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_12_a7/ %G ru %F DE_1971_7_12_a7