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@article{MAN_1980__250_163415, author = {G.N. Hile and W.E. Pfaffenberger}, title = {The {Relative} {Spectrum} of {Elements} in a {Real} {Banach} {Algebra.}}, journal = {Mathematische Annalen}, pages = {113--134}, publisher = {mathdoc}, volume = {250}, year = {1980}, zbl = {0421.46042}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__250_163415/} }
G.N. Hile; W.E. Pfaffenberger. The Relative Spectrum of Elements in a Real Banach Algebra.. Mathematische Annalen, Tome 250 (1980), pp. 113-134. http://geodesic.mathdoc.fr/item/MAN_1980__250_163415/