@article{DE_1998_34_4_a17,
     author = {R. Bayramov},
     title = {Nonselfadjoint quadratic operator pencils and elliptic problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {559--561},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_4_a17/}
}