@article{DAN_1990_314_1_a13,
     author = {V. A. Il'in},
     title = {The {Riesz} basis property for systems of root vector functions for a discontinuous {Schr\"odinger} operator with matrix potential},
     journal = {Doklady Akademii Nauk},
     pages = {59--62},
     publisher = {mathdoc},
     volume = {314},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_314_1_a13/}
}