@article{DE_1998_34_2_a15,
     author = {N. E. Tovmasyan and T. M. Kosheleva},
     title = {Exterior boundary value problems for second-order elliptic equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {256--259},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_2_a15/}
}