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@article{MAN_1968__176_161695, author = {G. NEUBAUER}, title = {Homotopy {Properties} of {Semi-Fredholm} {Operators} in {Banach} {Spaces.}}, journal = {Mathematische Annalen}, pages = {273--301}, publisher = {mathdoc}, volume = {176}, year = {1968}, zbl = {0163.37602}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__176_161695/} }
G. NEUBAUER. Homotopy Properties of Semi-Fredholm Operators in Banach Spaces.. Mathematische Annalen, Tome 176 (1968), pp. 273-301. http://geodesic.mathdoc.fr/item/MAN_1968__176_161695/