@article{10_4064_aa_55_3_229_232,
     author = {Masao Toyoizumi},
     title = {On certain character sums},
     journal = {Acta Arithmetica},
     pages = {229--232},
     publisher = {mathdoc},
     volume = {55},
     number = {3},
     year = {1990},
     doi = {10.4064/aa-55-3-229-232},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-55-3-229-232/}
}