%0 Journal Article %A Masao Toyoizumi %T On certain character sums %J Acta Arithmetica %D 1990 %P 229-232 %V 55 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-55-3-229-232/ %R 10.4064/aa-55-3-229-232 %G en %F 10_4064_aa_55_3_229_232