Geodesic
Remarks on the Pythagoras and Hasse number of real fields.
Journal für die reine und angewandte Mathematik, 0303_0304 (1978), pp. 284-294.

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Mots-clés : Sum of Squares, Pythagoras Number, Totally Indefinite Quadratic Form, Hasse Number, Uniquely Ordered Subfields, Isotropic, Local-Global Principle, Real Fields 
@article{JRAM_1978__0303_0304_152061,
     author = {Alexander Prestel},
     title = {Remarks on the {Pythagoras} and {Hasse} number of real fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {284--294},
     publisher = {mathdoc},
     volume = {0303_0304},
     year = {1978},
     zbl = {0396.10013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__0303_0304_152061/}
}
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Alexander Prestel. Remarks on the Pythagoras and Hasse number of real fields.. Journal für die reine und angewandte Mathematik, 0303_0304 (1978), pp. 284-294. http://geodesic.mathdoc.fr/item/JRAM_1978__0303_0304_152061/