Geodesic
Strong Tits Alternative for Subgroups of Coxeter Groups
Journal of Lie theory, Tome 12 (2002) no. 1, pp. 259-264.

Voir la notice de l'article provenant de la source Heldermann Verlag

It is proved that any subgroup of a Coxeter group has a finite index subgroup which either is abelian, or has a non-abelian free quotient. 
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     author = {G. A. Noskov and E. B. Vinberg },
     title = {Strong {Tits} {Alternative} for {Subgroups} of {Coxeter} {Groups}},
     journal = {Journal of Lie theory},
     pages = {259--264},
     publisher = {mathdoc},
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     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JLT_2002_12_1_JLT_2002_12_1_a12/}
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G. A. Noskov; E. B. Vinberg . Strong Tits Alternative for Subgroups of Coxeter Groups. Journal of Lie theory, Tome 12 (2002) no. 1, pp. 259-264. http://geodesic.mathdoc.fr/item/JLT_2002_12_1_JLT_2002_12_1_a12/