@article{DE_1977_13_12_a4,
     author = {Yu. A. Klokov and L. A. Lepin},
     title = {The first boundary value problem for a certain fourth order system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2149--2157},
     publisher = {mathdoc},
     volume = {13},
     number = {12},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_12_a4/}
}