@article{GT_2007_11_1_a7,
     author = {Levitt, Gilbert},
     title = {On the automorphism group of generalized {Baumslag{\textendash}Solitar} groups},
     journal = {Geometry & topology},
     pages = {473--515},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2007},
     doi = {10.2140/gt.2007.11.473},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2007.11.473/}
}