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@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/} }
F. Wolf. Analytic Perturbation of Operators in Banach Spaces.. Mathematische Annalen, Tome 124 (1951), pp. 317-333. http://geodesic.mathdoc.fr/item/MAN_1951__124_160282/