@article{DAN_1970_195_4_a4,
     author = {G. I. Marchuk and V. G. Vasil'ev},
     title = {The approximate solution of operator equations of the first kind},
     journal = {Doklady Akademii Nauk},
     pages = {773--775},
     publisher = {mathdoc},
     volume = {195},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_4_a4/}
}