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@article{PORMA_1997__54_1_47901, author = {Boasso, Enrico}, title = {On the spectral set of a solvable {Lie} algebra of operators.}, journal = {Portugaliae mathematica}, pages = {85--94}, publisher = {mathdoc}, volume = {54}, number = {1}, year = {1997}, zbl = {0891.47005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1997__54_1_47901/} }
Boasso, Enrico. On the spectral set of a solvable Lie algebra of operators.. Portugaliae mathematica, Tome 54 (1997) no. 1, pp. 85-94. http://geodesic.mathdoc.fr/item/PORMA_1997__54_1_47901/