Geodesic
The intersection theorem for orderings of higher level in rings.
Manuscripta mathematica, Tome 75 (1992) no. 4, pp. 273-278

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Zbl
Mots-clés : intersection theorem, orderings of commutative rings, preordering, Positivstellensatz of higher level, formally real fields 
Ralph Berr. The intersection theorem for orderings of higher level in rings.. Manuscripta mathematica, Tome 75 (1992) no. 4, pp. 273-278. http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155723/
@article{MM2_1992__75_4_155723,
     author = {Ralph Berr},
     title = {The intersection theorem for orderings of higher level in rings.},
     journal = {Manuscripta mathematica},
     pages = {273--278},
     year = {1992},
     volume = {75},
     number = {4},
     zbl = {0758.12003},
     url = {http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155723/}
}
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