@article{10_4064_sm_123_2_97_107,
     author = {J. J.  Koliha},
     title = {Spectral sets},
     journal = {Studia Mathematica},
     pages = {97--107},
     year = {1997},
     volume = {123},
     number = {2},
     doi = {10.4064/sm-123-2-97-107},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-123-2-97-107/}
}