@article{MZ_1978__160_172670,
     author = {Walter Eberhard and Gerhard Freiling},
     title = {Stone-regul\"are {Eigenwertprobleme.}},
     journal = {Mathematische Zeitschrift},
     pages = {139--162},
     publisher = {mathdoc},
     volume = {160},
     year = {1978},
     zbl = {0363.34021},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__160_172670/}
}