@article{AL_2010_49_3_a1,
     author = {F. A. Dudkin},
     title = {Subgroups of finite index in {Baumslag--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/}
}