@article{MOMA_1969__73_177473,
     author = {L.J. Mordell},
     title = {Some {Exponential} {Sums} in {Several} {Variables.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {348--353},
     publisher = {mathdoc},
     volume = {73},
     year = {1969},
     zbl = {0186.08202},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1969__73_177473/}
}