@article{MZ_1967__100_170804,
     author = {A. Duane Porter},
     title = {Some {Systems} of {Equations} in a {Finite} {Field.}},
     journal = {Mathematische Zeitschrift},
     pages = {141--145},
     publisher = {mathdoc},
     volume = {100},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__100_170804/}
}