@article{DAN_1970_192_5_a3,
     author = {R. I. Kachurovskii},
     title = {On a {Fredholm} theory for nonlinear operator equations},
     journal = {Doklady Akademii Nauk},
     pages = {969--972},
     year = {1970},
     volume = {192},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_5_a3/}
}