%0 Journal Article %A R. I. Kachurovskii %T A.\,N.~Tihonov's fixed point principle for equations with operators which are weakly closed on the kernel %J Doklady Akademii Nauk %D 1968 %P 517-520 %V 183 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1968_183_3_a4/ %G ru %F DAN_1968_183_3_a4