@article{MOMA_1991__112_3_178533,
     author = {F.J. Schnitzer and H.G. Kopetzky},
     title = {On the {Dispersion} {Spectrum.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {115--124},
     publisher = {mathdoc},
     volume = {112},
     number = {3},
     year = {1991},
     zbl = {0741.11037},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1991__112_3_178533/}
}