Geodesic
Free subgroups in almost subnormal subgroups of general skew linear groups
Algebra i analiz, Tome 28 (2016) no. 5, pp. 220-235.

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Let $D$ be a weakly locally finite division ring and $n$ a positive integer. In this paper, we investigate the problem on the existence of noncyclic free subgroups in noncentral almost subnormal subgroups of the general linear group $\mathrm{GL}_n(D)$. Further, some applications of this fact are also investigated. In particular, all infinite finitely generated almost subnormal subgroups of $\mathrm{GL}_n(D)$ are described.
Keywords: division rings, linear groups, almost subnormal subgroups, noncyclic free subgroups, generalized group identity. 
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N. K. Ngoc; M. H. Bien; B. X. Hai. Free subgroups in almost subnormal subgroups of general skew linear groups. Algebra i analiz, Tome 28 (2016) no. 5, pp. 220-235. http://geodesic.mathdoc.fr/item/AA_2016_28_5_a5/

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