@article{DAN_1968_180_5_a1,
     author = {Yu. E. Boyarintsev and V. G. Vasil'ev},
     title = {On the theory of the convergence of approximate solutions of an operator equation},
     journal = {Doklady Akademii Nauk},
     pages = {1027--1028},
     publisher = {mathdoc},
     volume = {180},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_5_a1/}
}