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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Mots-clés : intersection theorem, orderings of commutative rings, preordering, Positivstellensatz of higher level, formally real fields 
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     author = {Ralph Berr},
     title = {The intersection theorem for orderings of higher level in rings.},
     journal = {Manuscripta mathematica},
     pages = {273--278},
     publisher = {mathdoc},
     volume = {75},
     number = {4},
     year = {1992},
     zbl = {0758.12003},
     url = {http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155723/}
}
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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/