@article{10_4064_aa_86_2_149_154,
     author = {HongBing Yu},
     title = {On two problems of {Mordell} about exponential sums},
     journal = {Acta Arithmetica},
     pages = {149--154},
     publisher = {mathdoc},
     volume = {86},
     number = {2},
     year = {1998},
     doi = {10.4064/aa-86-2-149-154},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-86-2-149-154/}
}