@article{10_21136_CMJ_1964_100615,
     author = {Mordell, Louis Joel},
     title = {Incomplete exponential sums and incomplete residue systems for congruences},
     journal = {Czechoslovak Mathematical Journal},
     pages = {235--242},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1964},
     doi = {10.21136/CMJ.1964.100615},
     mrnumber = {0170875},
     zbl = {0135.10502},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1964.100615/}
}