@article{IVM_1975_11_a1,
     author = {A. L. Belopol'skii},
     title = {Scattering problems for a~pair of spaces with an unbounded identification operator},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {11--20},
     publisher = {mathdoc},
     number = {11},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_11_a1/}
}