@article{AIF_2015__65_2_725_0,
     author = {Levitt, Gilbert},
     title = {Generalized {Baumslag{\textendash}Solitar} groups: rank and finite index subgroups},
     journal = {Annales de l'Institut Fourier},
     pages = {725--762},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {65},
     number = {2},
     year = {2015},
     doi = {10.5802/aif.2943},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2943/}
}