@article{DE_1990_26_6_a1,
     author = {S. A. Bespalova and Yu. A. Klokov},
     title = {A boundary value problem for a fourth-order system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {931--933},
     year = {1990},
     volume = {26},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_6_a1/}
}