@article{ELMA_1982__37_141290,
     author = {A. Ecker},
     title = {On primitive roots.},
     journal = {Elemente der Mathematik},
     pages = {103--108},
     publisher = {mathdoc},
     volume = {37},
     year = {1982},
     zbl = {0485.10001},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1982__37_141290/}
}