@article{MAN_1951__124_160282,
     author = {F. Wolf},
     title = {Analytic {Perturbation} of {Operators} in {Banach} {Spaces.}},
     journal = {Mathematische Annalen},
     pages = {317--333},
     publisher = {mathdoc},
     volume = {124},
     year = {1951},
     zbl = {0046.12402},
     url = {http://geodesic.mathdoc.fr/item/MAN_1951__124_160282/}
}