Geodesic
On the freedom problem in Coxeter groups of extra large type
Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 8, pp. 101-116
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In this paper, it is proved that in a Coxeter group of extra large type every torsion-free, finitely generated subgroup is free. 
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I. V. Dobrynina. On the freedom problem in Coxeter groups of extra large type. Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 8, pp. 101-116. http://geodesic.mathdoc.fr/item/FPM_2008_14_8_a4/

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