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@article{10_4064_fm_64_3_341_373, author = {Kazimierz G\k{e}ba}, title = {Fredholm \ensuremath{\sigma}-proper maps of {Banach} spaces}, journal = {Fundamenta Mathematicae}, pages = {341--373}, publisher = {mathdoc}, volume = {64}, number = {3}, year = {1969}, doi = {10.4064/fm-64-3-341-373}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-64-3-341-373/} }
Kazimierz Gęba. Fredholm σ-proper maps of Banach spaces. Fundamenta Mathematicae, Tome 64 (1969) no. 3, pp. 341-373. doi : 10.4064/fm-64-3-341-373. http://geodesic.mathdoc.fr/articles/10.4064/fm-64-3-341-373/
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