@article{DAN_1968_183_3_a4,
     author = {R. I. Kachurovskii},
     title = {A. {N.~Tihonov's} fixed point principle for equations with operators which are weakly closed on the kernel},
     journal = {Doklady Akademii Nauk},
     pages = {517--520},
     year = {1968},
     volume = {183},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_183_3_a4/}
}