@article{DAN_1988_301_1_a7,
     author = {Yu. D. Salmanov},
     title = {The first boundary value problem for differential equations of},
     journal = {Doklady Akademii Nauk},
     pages = {38--41},
     publisher = {mathdoc},
     volume = {301},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_301_1_a7/}
}