@article{DE_1985_21_3_a7,
     author = {S. A. Abdo and N. J. Yurchuk},
     title = {Multipoint boundary value problems for certain operator-differential equations. {I.} {A} priori estimates},
     journal = {Differencialʹnye uravneni\^a},
     pages = {417--425},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_3_a7/}
}