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@article{MOMA_1981__92_178040, author = {Wilfried Hauenschild and Jean Ludwig}, title = {The {Injection} and the {Protection} {Theorem} for {Spectral} {Sets}}, journal = {Monatshefte f\"ur Mathematik}, pages = {167--178}, publisher = {mathdoc}, volume = {92}, year = {1981}, zbl = {0458.43009}, url = {http://geodesic.mathdoc.fr/item/MOMA_1981__92_178040/} }
Wilfried Hauenschild; Jean Ludwig. The Injection and the Protection Theorem for Spectral Sets. Monatshefte für Mathematik, Tome 92 (1981), pp. 167-178. http://geodesic.mathdoc.fr/item/MOMA_1981__92_178040/