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@article{MZ_1981__178_173114, author = {Lutz Weis}, title = {Perturbation {Classes} of {Semi-Fredholm} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {429--442}, publisher = {mathdoc}, volume = {178}, year = {1981}, zbl = {0541.47010}, url = {http://geodesic.mathdoc.fr/item/MZ_1981__178_173114/} }
Lutz Weis. Perturbation Classes of Semi-Fredholm Operators.. Mathematische Zeitschrift, Tome 178 (1981), pp. 429-442. http://geodesic.mathdoc.fr/item/MZ_1981__178_173114/