Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1971__192_162147, author = {Bernhard GRAMSCH and David LAY}, title = {Spectral {Mapping} {Theorems} for {Essential} {Spectra.}}, journal = {Mathematische Annalen}, pages = {17--32}, publisher = {mathdoc}, volume = {192}, year = {1971}, zbl = {0203.45601}, url = {http://geodesic.mathdoc.fr/item/MAN_1971__192_162147/} }
Bernhard GRAMSCH; David LAY. Spectral Mapping Theorems for Essential Spectra.. Mathematische Annalen, Tome 192 (1971), pp. 17-32. http://geodesic.mathdoc.fr/item/MAN_1971__192_162147/