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@article{MZ_1977__154_172530, author = {Robin Harte and Wickstead Anthony}, title = {Upper and {Lower} {Fredholm} {Spectra} {II.}}, journal = {Mathematische Zeitschrift}, pages = {253--256}, publisher = {mathdoc}, volume = {154}, year = {1977}, zbl = {0393.47001}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__154_172530/} }
Robin Harte; Wickstead Anthony. Upper and Lower Fredholm Spectra II.. Mathematische Zeitschrift, Tome 154 (1977), pp. 253-256. http://geodesic.mathdoc.fr/item/MZ_1977__154_172530/