@article{DE_1995_31_12_a13,
     author = {D. U. Umbetzhanov},
     title = {On correctly solvable boundary value problems for systems of equations with higher-order elliptic operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2056--2062},
     publisher = {mathdoc},
     volume = {31},
     number = {12},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_12_a13/}
}