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机译:Cyclic normal subgroups of generalized Baumslag-Solitar groups
Illinois State Univ, Dept Math, Normal, IL 61761 USA;
Univ Illinois, Dept Math, Urbana, IL 61801 USA;
Bradley Univ, Dept Math, Peoria, IL 61625 USA;
Covering group; cyclic radical; generalized Baumslag-Solitar group;