@article{GT_2002_6_1_a7,
     author = {Forester, Max},
     title = {Deformation and rigidity of simplicial group actions on trees},
     journal = {Geometry & topology},
     pages = {219--267},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2002},
     doi = {10.2140/gt.2002.6.219},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2002.6.219/}
}