@article{10_4171_ggd_119,
     author = {Volodymyr V. Nekrashevych and G\'abor Pete},
     title = {Scale-invariant groups},
     journal = {Groups, geometry, and dynamics},
     pages = {139--167},
     year = {2011},
     volume = {5},
     number = {1},
     doi = {10.4171/ggd/119},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/119/}
}