@article{TRSPY_1973_132_a3,
     author = {L. J. Mordell},
     title = {Some exponential sums},
     journal = {Informatics and Automation},
     pages = {30--34},
     publisher = {mathdoc},
     volume = {132},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1973_132_a3/}
}