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@article{PORMA_1990__47_1_115701, author = {Cross, R.W.}, title = {Unbounded linear transformations of upper {semi-Fredholm} type in normed spaces}, journal = {Portugaliae mathematica}, pages = {61--79}, publisher = {mathdoc}, volume = {47}, number = {1}, year = {1990}, mrnumber = {1079507}, zbl = {0734.47006}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_1_115701/} }
Cross, R.W. Unbounded linear transformations of upper semi-Fredholm type in normed spaces. Portugaliae mathematica, Tome 47 (1990) no. 1, pp. 61-79. http://geodesic.mathdoc.fr/item/PORMA_1990__47_1_115701/