@article{DAN_1987_293_4_a2,
     author = {I. E. Egorov},
     title = {Solvability of a boundary value problem for a higher-order},
     journal = {Doklady Akademii Nauk},
     pages = {785--788},
     year = {1987},
     volume = {293},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_4_a2/}
}