@article{DAN_1972_206_4_a12,
     author = {I. N. Okinshevich},
     title = {On convergence and stability of some approximate methods of solving nonlinear operator equations},
     journal = {Doklady Akademii Nauk},
     pages = {823--826},
     publisher = {mathdoc},
     volume = {206},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_206_4_a12/}
}