%0 Journal Article %A K. I. Chernyshov %T Tihonov's theorem for an equation with a Fredholm operator %J Differencialʹnye uravneniâ %D 1977 %P 1625-1636 %V 13 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_9_a8/ %G ru %F DE_1977_13_9_a8