Geodesic
Rational closures of group rings of left-ordered groups
Sbornik. Mathematics, Tome 79 (1994) no. 2, pp. 231-263 
N. I. Dubrovin. Rational closures of group rings of left-ordered groups. Sbornik. Mathematics, Tome 79 (1994) no. 2, pp. 231-263. http://geodesic.mathdoc.fr/item/SM_1994_79_2_a0/
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     author = {N. I. Dubrovin},
     title = {Rational closures of group rings of left-ordered groups},
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     url = {http://geodesic.mathdoc.fr/item/SM_1994_79_2_a0/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Suppose $K$ is a division ring, and $G$ is a left-ordered group such that for any Dedekind cut $\varepsilon$ of the linearly ordered set $(G,\le)$ the group $S=\{g\in G\mid g\varepsilon=\varepsilon\}$ is such that $KS$ is a right Ore domain and the group $H=\{g\in G\mid gP(G)g^{-1}=P(G)\}$ is cofinal in $G$. Then the group ring $KG$ can be embedded in a division ring having a valuation in the sense of Mathiak with values in $G$. If $G$ is the group of a trifolium, this construction leads to an example of a chain domain with a prime, but not completely prime, ideal.

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