Sums of mixed powers in fields and orderings of prescribed level.
Mathematische Zeitschrift, Tome 210 (1992) no. 1, pp. 513-528.

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Mots-clés : ordered fields, Hilbert identities, formally real field, ordering, sums of mixed powers of fields, orderings of higher level, total orders, valuation fan, order fans, chain signatures, chain modules, maximal preorderings, identity for sums of mixed powers
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     author = {Ralph Berr},
     title = {Sums of mixed powers in fields and orderings of prescribed level.},
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}
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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/