@article{GDZPPN002354195, title = {Operators with thin spectral sets.}, journal = {Mathematica Scandinavica}, volume = {38}, year = {1976}, pages = {367-370}, zbl = {0349.47020}, url = {http://dml.mathdoc.fr/item/GDZPPN002354195} }
Hirschfeld, Rudolf A. Operators with thin spectral sets.. Mathematica Scandinavica, Tome 38 (1976) pp. 367-370. http://gdmltest.u-ga.fr/item/GDZPPN002354195/