@article{DE_1971_7_9_a20,
     author = {O. A. Liskovets},
     title = {Stability of quasi-solutions for equations with a closed operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1707--1709},
     publisher = {mathdoc},
     volume = {7},
     number = {9},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_9_a20/}
}