Geodesic
On the root-class residuality of generalized free products with a~normal amalgamation
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2015), pp. 27-44.

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We obtain both necessary and sufficient conditions for the free product of two groups with normal amalgamated subgroups to be a residually $\mathcal C$-group, where $\mathcal C$ is a root class of groups, which must be homomorphically closed in most cases.
Keywords: generalized free product, residual property, root class of groups. 
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E. A. Tumanova. On the root-class residuality of generalized free products with a~normal amalgamation. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2015), pp. 27-44. http://geodesic.mathdoc.fr/item/IVM_2015_10_a2/

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