Geodesic
Sums of 2m-th powers of rational functions in one variable over real closed fields.
Mathematische Zeitschrift, Tome 221 (1996) no. 1, pp. 93-112.

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Mots-clés : sums of higher even powers of rational functions, real closed field, Pythagoras number 
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     author = {T.Y. Lam and A. Prestel and M.D. Choi},
     title = {Sums of 2m-th powers of rational functions in one variable over real closed fields.},
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     pages = {93--112},
     publisher = {mathdoc},
     volume = {221},
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     year = {1996},
     zbl = {0859.12002},
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}
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T.Y. Lam; A. Prestel; M.D. Choi. Sums of 2m-th powers of rational functions in one variable over real closed fields.. Mathematische Zeitschrift, Tome 221 (1996) no. 1, pp. 93-112. http://geodesic.mathdoc.fr/item/MZ_1996__221_1_174837/