@article{IVM_1962_5_a5,
     author = {P. B. Kagan},
     title = {Sobolev functional spaces of negative order and their application to the {Neumann} problem},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {43--46},
     publisher = {mathdoc},
     number = {5},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1962_5_a5/}
}