@article{DE_1970_6_4_a3,
     author = {V. I. Zubov},
     title = {On the theory of the existence of solutions of boundary value problems for systems of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {629--631},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_4_a3/}
}