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@article{MAN_1980__254_163487, author = {R. Mennicken and B. Sagraloff}, title = {Analytic {Perturbation} of {Semi-Fredholm} {Operators.}}, journal = {Mathematische Annalen}, pages = {177--188}, publisher = {mathdoc}, volume = {254}, year = {1980}, zbl = {0431.47008}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__254_163487/} }
R. Mennicken; B. Sagraloff. Analytic Perturbation of Semi-Fredholm Operators.. Mathematische Annalen, Tome 254 (1980), pp. 177-188. http://geodesic.mathdoc.fr/item/MAN_1980__254_163487/