Geodesic
Approximability of HNN-Extensions with Central Associated Subgroups by a Root Class of Groups
Matematičeskie zametki, Tome 97 (2015) no. 5, pp. 665-669

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HNN-extensions of a group with central associated subgroups are considered. Several conditions are obtained for the approximability of such HNN-extensions by a class of groups which have the root property and is closed with respect to factorization.
Keywords: group with root property, HNN-extension, residually $\mathscr K$ group for a class $\mathscr K$ of groups, central subgroup. 
@article{MZM_2015_97_5_a2,
     author = {D. V. Gol'tsov},
     title = {Approximability of {HNN-Extensions} with {Central} {Associated} {Subgroups} by a {Root} {Class} of {Groups}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {665--669},
     publisher = {mathdoc},
     volume = {97},
     number = {5},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2015_97_5_a2/}
}
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D. V. Gol'tsov. Approximability of HNN-Extensions with Central Associated Subgroups by a Root Class of Groups. Matematičeskie zametki, Tome 97 (2015) no. 5, pp. 665-669. http://geodesic.mathdoc.fr/item/MZM_2015_97_5_a2/