%0 Journal Article %A Hong Bing Yu %T Estimates of character sums with exponential function %J Acta Arithmetica %D 2001 %P 211-218 %V 97 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa97-3-2/ %R 10.4064/aa97-3-2 %G en %F 10_4064_aa97_3_2