Geodesic
Subgroups of finite index in Baumslag–Solitar groups
Algebra i logika, Tome 49 (2010) no. 3, pp. 331-345

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A complete description is given for all subgroups of index $n$ in Baumslag–Solitar groups $BS(p,q)$.
Keywords: two-generator one-relator non-Hopfian group, Baumslag–Solitar group. 
@article{AL_2010_49_3_a1,
     author = {F. A. Dudkin},
     title = {Subgroups of finite index in {Baumslag{\textendash}Solitar} groups},
     journal = {Algebra i logika},
     pages = {331--345},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2010_49_3_a1/}
}
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F. A. Dudkin. Subgroups of finite index in Baumslag–Solitar groups. Algebra i logika, Tome 49 (2010) no. 3, pp. 331-345. http://geodesic.mathdoc.fr/item/AL_2010_49_3_a1/