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@article{MZ_1992__210_1_174416, author = {Ralph Berr}, title = {Sums of mixed powers in fields and orderings of prescribed level.}, journal = {Mathematische Zeitschrift}, pages = {513--528}, publisher = {mathdoc}, volume = {210}, number = {1}, year = {1992}, zbl = {0764.12003}, url = {http://geodesic.mathdoc.fr/item/MZ_1992__210_1_174416/} }
Ralph Berr. Sums of mixed powers in fields and orderings of prescribed level.. Mathematische Zeitschrift, Tome 210 (1992) no. 1, pp. 513-528. http://geodesic.mathdoc.fr/item/MZ_1992__210_1_174416/