Geodesic
On the freedom problem in Coxeter groups of extra large type
Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 8, pp. 101-116

Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper, it is proved that in a Coxeter group of extra large type every torsion-free, finitely generated subgroup is free. 
@article{FPM_2008_14_8_a4,
     author = {I. V. Dobrynina},
     title = {On the freedom problem in {Coxeter} groups of extra large type},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {101--116},
     publisher = {mathdoc},
     volume = {14},
     number = {8},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_8_a4/}
}
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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/