Geodesic
Normal subgroups of free constructions
Sbornik. Mathematics, Tome 54 (1986) no. 2, pp. 367-385

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In this paper the technique of group action on a tree is used to obtain solutions of the following problems. Suppose that the group $G$ is a free construction. 1. Describe the normal subgroups of $G$ not containing non-Abelian free subgroups. 2. Describe the normal subgroups $A$ and $B$ of $G$ if the mutual commutator subgroup $[A,B]$ does not contain non-Abelian free subgroups. The results are applied to groups obtained by using a sequence of operations of taking $HNN$-extensions and forming free products with amalgamation. Bibliography: 16 titles. 
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     author = {Yu. V. Tishin},
     title = {Normal subgroups of free constructions},
     journal = {Sbornik. Mathematics},
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Yu. V. Tishin. Normal subgroups of free constructions. Sbornik. Mathematics, Tome 54 (1986) no. 2, pp. 367-385. http://geodesic.mathdoc.fr/item/SM_1986_54_2_a4/