@article{10_4171_ggd_376,
     author = {Udo Baumgartner and Jacqui Ramagge and George A. Willis},
     title = {Scale-multiplicative semigroups and geometry: automorphism groups of trees},
     journal = {Groups, geometry, and dynamics},
     pages = {1051--1075},
     year = {2016},
     volume = {10},
     number = {3},
     doi = {10.4171/ggd/376},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/376/}
}