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@article{MZ_1955__63_169523, author = {Erich H. Rothe}, title = {Mapping degree in {Banach} spaces and spectral theory.}, journal = {Mathematische Zeitschrift}, pages = {195--218}, publisher = {mathdoc}, volume = {63}, year = {1955}, zbl = {0065.35503}, url = {http://geodesic.mathdoc.fr/item/MZ_1955__63_169523/} }
Erich H. Rothe. Mapping degree in Banach spaces and spectral theory.. Mathematische Zeitschrift, Tome 63 (1955), pp. 195-218. http://geodesic.mathdoc.fr/item/MZ_1955__63_169523/