@article{DE_1972_8_11_a9,
     author = {A. A. Martynyuk},
     title = {\"Uber die {Approximation} der {L\"osungen} von linearen {Gleichungen} im {Banachraum}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1988--1993},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a9/}
}