@article{DE_1996_32_3_a8,
     author = {V. K. Romanko},
     title = {On regular operators for linear systems of equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {339--345},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_3_a8/}
}