@article{10_4064_aa116_1_4,
     author = {Todd Cochrane and Jeremy Coffelt and Christopher Pinner},
     title = {A further refinement of {Mordell's} bound
 on exponential sums},
     journal = {Acta Arithmetica},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {116},
     number = {1},
     year = {2005},
     doi = {10.4064/aa116-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa116-1-4/}
}