@article{10_4064_sm173_2_6,
     author = {Mourad Oudghiri},
     title = {a-Weyl's theorem and perturbations},
     journal = {Studia Mathematica},
     pages = {193--201},
     publisher = {mathdoc},
     volume = {173},
     number = {2},
     year = {2006},
     doi = {10.4064/sm173-2-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm173-2-6/}
}