%0 Journal Article %A Kenneth Williams %A Kenneth Hardy %T Determination of $∑_{k=1}^{p-1} g^{ak²}$ modulo p %J Acta Arithmetica %D 1992 %P 161-172 %V 61 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-61-2-161-172/ %R 10.4064/aa-61-2-161-172 %G en %F 10_4064_aa_61_2_161_172