@article{ZAA_1999__18_4_48550,
     author = {Biberdorf, E.A. and V\"ath, M.},
     title = {On the spectrum of orthomorphisms and {Barbashin} operators.},
     journal = {Zeitschrift f\"ur Analysis und ihre Anwendungen},
     pages = {859--873},
     year = {1999},
     volume = {18},
     number = {4},
     zbl = {0947.45002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZAA_1999__18_4_48550/}
}