@article{IVM_1975_3_a0,
     author = {M. Sh. Birman and L. S. Koplienko and M. Z. Solomyak},
     title = {Estimates of the spectrum of a~difference of fractional powers of selfadjoint operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--10},
     publisher = {mathdoc},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_3_a0/}
}