@article{DAN_1974_218_1_a10,
     author = {I. M. Spitkovsky},
     title = {Stability of partial indices of a {Riemann} boundary-value problem with a strictly nonsingular matrix},
     journal = {Doklady Akademii Nauk},
     pages = {46--49},
     publisher = {mathdoc},
     volume = {218},
     number = {1},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_218_1_a10/}
}