@article{IVM_1997_7_a8,
     author = {G. A. Sviridyuk and T. G. Sukacheva and L. L. Dudko},
     title = {Relative $\sigma$-boundedness of linear operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {68--73},
     publisher = {mathdoc},
     number = {7},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_7_a8/}
}