Geodesic
Hilbert's 17-th problem for sums of 2n-th powers.
Journal für die reine und angewandte Mathematik, Tome 450 (1994), pp. 139-158.

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Mots-clés : real closed field of higher level, real valuation, real algebraic set, sums of -th powers, Hilbert's 17-th problem, formally real field 
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     author = {E. Becker and R. Berr and F. Delon and D. Gondard},
     title = {Hilbert's 17-th problem for sums of 2n-th powers.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {139--158},
     publisher = {mathdoc},
     volume = {450},
     year = {1994},
     zbl = {0807.14045},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1994__450_153618/}
}
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E. Becker; R. Berr; F. Delon; D. Gondard. Hilbert's 17-th problem for sums of 2n-th powers.. Journal für die reine und angewandte Mathematik, Tome 450 (1994), pp. 139-158. http://geodesic.mathdoc.fr/item/JRAM_1994__450_153618/