@article{RM_1970_25_3_a18,
     author = {G. A. Voropaeva},
     title = {The theorem of {M.\,V.~Keldysh} on $n$-fold completeness, and the convergence of the solution of {a~Cauchy} difference problem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_3_a18/}
}