Geodesic
Generalised triangle groups of type $\mathbf{(3,q,2)}$
Algebra and discrete mathematics, Tome 15 (2013) no. 1, pp. 1-18.

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If $G$ is a group with a presentation of the form $\langle x,y|x^3=y^q=W(x,y)^2=1\rangle$, then either $G$ is virtually soluble or $G$ contains a free subgroup of rank $2$. This provides additional evidence in favour of a conjecture of Rosenberger.
Keywords: Generalized triangle groups
Mots-clés : Tits alternative. 
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J. Howie. Generalised triangle groups of type $\mathbf{(3,q,2)}$. Algebra and discrete mathematics, Tome 15 (2013) no. 1, pp. 1-18. http://geodesic.mathdoc.fr/item/ADM_2013_15_1_a1/

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