@article{DE_1994_30_12_a3,
     author = {N. G. Ivin},
     title = {On the basis property of systems of eigen- and associated vector functions of the matrix {Schr\"odinger} operator that correspond to matrix eigenvalues},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2051--2063},
     publisher = {mathdoc},
     volume = {30},
     number = {12},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_12_a3/}
}