@article{IVM_1991_11_a0,
     author = {Yu. G. Abakumov and V. G. Banin},
     title = {An approach to the study of approximation properties of linear operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--6},
     publisher = {mathdoc},
     number = {11},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_11_a0/}
}