@article{DAN_1958_121_1_a6,
     author = {V. M. Kabanova},
     title = {On the expansion in characteristic vector-functions of non-selfadjoint second order differential systems},
     journal = {Doklady Akademii Nauk},
     pages = {30--33},
     publisher = {mathdoc},
     volume = {121},
     number = {1},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_1_a6/}
}