@article{IVM_1964_3_a12,
     author = {L. Kh. Liberman},
     title = {Some problems in the theory of approximating solutions of differential-operator equations in {Hilbert} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {88--92},
     publisher = {mathdoc},
     number = {3},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1964_3_a12/}
}