@article{MZ_1956__64_169558,
     author = {Karl Zeller},
     title = {\"Uber den perfekten {Teil} von {Wirkfeldern.}},
     journal = {Mathematische Zeitschrift},
     pages = {123--130},
     publisher = {mathdoc},
     volume = {64},
     year = {1956},
     zbl = {0070.05905},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__64_169558/}
}