@article{MZ_1993__214_1_174573,
     author = {E.B. Davies},
     title = {Eigenvalue stability bounds via weighted {Sobolov} spaces.},
     journal = {Mathematische Zeitschrift},
     pages = {357--372},
     publisher = {mathdoc},
     volume = {214},
     number = {1},
     year = {1993},
     zbl = {0799.58082},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174573/}
}