@article{10_4064_aa_59_2_149_155,
     author = {Ping Ding},
     title = {An improvement to {Chalk's} estimation of exponential sums},
     journal = {Acta Arithmetica},
     pages = {149--155},
     publisher = {mathdoc},
     volume = {59},
     number = {2},
     year = {1991},
     doi = {10.4064/aa-59-2-149-155},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-59-2-149-155/}
}