@article{CRMATH_2009__347_9-10_483_0,
     author = {Aleksei Aleksandrov and Vladimir Peller},
     title = {Functions of perturbed operators},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {483--488},
     publisher = {Elsevier},
     volume = {347},
     number = {9-10},
     year = {2009},
     doi = {10.1016/j.crma.2009.03.004},
     language = {en},
}