@article{DE_1977_13_9_a8,
     author = {K. I. Chernyshov},
     title = {Tihonov's theorem for an equation with a {Fredholm} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1625--1636},
     publisher = {mathdoc},
     volume = {13},
     number = {9},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_9_a8/}
}