@article{1256053304, author = {Fine, N. J.}, title = {On a question of Ayoub, Chowla and Walum concerning character sums}, journal = {Illinois J. Math.}, volume = {14}, number = {4}, year = {1970}, pages = { 88-90}, language = {en}, url = {http://dml.mathdoc.fr/item/1256053304} }
Fine, N. J. On a question of Ayoub, Chowla and Walum concerning character sums. Illinois J. Math., Tome 14 (1970) no. 4, pp. 88-90. http://gdmltest.u-ga.fr/item/1256053304/