@article{MM2_1986__54_155112,
     author = {Hans-Dieter Wacker},
     title = {Formeln f\"ur {Pole} der {Resolvente} und den {Radius} eines wesentlichen  {Spektrums.}},
     journal = {Manuscripta mathematica},
     pages = {249--260},
     publisher = {mathdoc},
     volume = {54},
     year = {1986},
     zbl = {0585.47002},
     url = {http://geodesic.mathdoc.fr/item/MM2_1986__54_155112/}
}