Geodesic
On the Pythagoras number of a real irreducible algebroid curve.
Mathematische Annalen, Tome 289 (1991) no. 4, pp. 111-124.

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Mots-clés : Pythagoras number, real domain, formal power series, numerical semigroup, curves with a given semigroup 
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     author = {Jesus J. Ortega},
     title = {On the {Pythagoras} number of a real irreducible algebroid curve.},
     journal = {Mathematische Annalen},
     pages = {111--124},
     publisher = {mathdoc},
     volume = {289},
     number = {4},
     year = {1991},
     zbl = {0743.14041},
     url = {http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164771/}
}
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Jesus J. Ortega. On the Pythagoras number of a real irreducible algebroid curve.. Mathematische Annalen, Tome 289 (1991) no. 4, pp. 111-124. http://geodesic.mathdoc.fr/item/MAN_1991__289_4_164771/