@article{DE_1978_14_6_a13,
     author = {V. K. Romanko},
     title = {Solvability of boundary value problems for higher order operator-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1081--1092},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_6_a13/}
}