@article{ZNSL_1976_56_a7,
     author = {J. B. Farforovskaja},
     title = {An estimate of the norm $|f(B)-f(A)|$ for selfadjoint operators~$A$ and $B$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {143--162},
     publisher = {mathdoc},
     volume = {56},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_56_a7/}
}