@article{DE_1987_23_4_a4,
     author = {V. Ya. Derr},
     title = {On the transformation of some multipoint boundary value problems into the de la {Vall\'ee--Poussin} problem and of the conditions of solvability},
     journal = {Differencialʹnye uravneni\^a},
     pages = {598--608},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_4_a4/}
}