@article{IVM_1967_12_a5,
     author = {G. S. Litvinchuk},
     title = {Two theorems on the stability of the partial indices of {Riemann's} boundary value problem and their application},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {47--57},
     publisher = {mathdoc},
     number = {12},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_12_a5/}
}