@article{MM2_1974__13_154256,
     author = {Wolfgang Hackenbroch},
     title = {\"Uber den {Freudenthalschen} {Spektralsatz.}},
     journal = {Manuscripta mathematica},
     pages = {83--100},
     publisher = {mathdoc},
     volume = {13},
     year = {1974},
     zbl = {0284.46011},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__13_154256/}
}