@article{MZ_1967__101_170836,
     author = {Bernhard Gramsch},
     title = {Spektraleigenschaften analytischer {Operatorfunktionen.}},
     journal = {Mathematische Zeitschrift},
     pages = {165--181},
     publisher = {mathdoc},
     volume = {101},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__101_170836/}
}