@article{IVM_1977_2_a17,
     author = {S. A. Shelepen'},
     title = {An estimate of the norm of an inverse operator by the method of orthogonal complements},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {124--126},
     publisher = {mathdoc},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_2_a17/}
}