@article{AM2_1975__12_136511,
     author = {Kenneth S. Williams},
     title = {Note on a {Cubic} {Character} {Sum.}},
     journal = {Aequationes mathematicae},
     pages = {229--231},
     publisher = {mathdoc},
     volume = {12},
     year = {1975},
     zbl = {0307.10038},
     url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136511/}
}