Geodesic
Certain conditions of the root-class residuality of generalized free products with a normal amalgamated subgroup
Čebyševskij sbornik, Tome 14 (2013) no. 3, pp. 134-141.

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Let $\mathcal{K}$ be an arbitrary root class of groups. We prove a sufficient condition of the $\mathcal{K}$-residuality of the generalized free product of two $\mathcal{K}$-groups with a normal amalgamated subgroup.
Keywords: root classes of groups, residual properties, generalized free products. 
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E. A. Tumanova. Certain conditions of the root-class residuality of generalized free products with a normal amalgamated subgroup. Čebyševskij sbornik, Tome 14 (2013) no. 3, pp. 134-141. http://geodesic.mathdoc.fr/item/CHEB_2013_14_3_a16/

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