@article{ARM_1969__5_4_a7,
     author = {Schubert, Hans},
     title = {Einige {Hilfss\"atze} der ebenen {Potentialtheorie}},
     journal = {Archivum mathematicum},
     pages = {215--225},
     publisher = {mathdoc},
     volume = {05},
     number = {4},
     year = {1969},
     mrnumber = {0289798},
     zbl = {0231.31001},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/item/ARM_1969__5_4_a7/}
}