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@article{MS2_1978__43_166629, author = {Kristi Mattila}, title = {On proper boundary points of the spectrum and complemented eigenspaces.}, journal = {Mathematica Scandinavica}, pages = {363--368}, publisher = {mathdoc}, volume = {43}, year = {1978}, zbl = {0387.47001}, url = {http://geodesic.mathdoc.fr/item/MS2_1978__43_166629/} }
Kristi Mattila. On proper boundary points of the spectrum and complemented eigenspaces.. Mathematica Scandinavica, Tome 43 (1978), pp. 363-368. http://geodesic.mathdoc.fr/item/MS2_1978__43_166629/