@article{ELMA_1983__38_141324,
     author = {Horst Bergmann},
     title = {\"Uber eine {Formel} f\"ur primitive {Kongruenzwurzeln.}},
     journal = {Elemente der Mathematik},
     pages = {142--144},
     publisher = {mathdoc},
     volume = {38},
     year = {1983},
     zbl = {0541.10003},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1983__38_141324/}
}