@article{10_4064_sm_134_2_111_117,
     author = {Rajendra Bhatia and Driss Drissi},
     title = {Perturbation theorems for {Hermitian} elements in {Banach} algebras},
     journal = {Studia Mathematica},
     pages = {111--117},
     publisher = {mathdoc},
     volume = {134},
     number = {2},
     year = {1999},
     doi = {10.4064/sm-134-2-111-117},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-134-2-111-117/}
}