@article{10_4171_ggd_252,
     author = {Volodymyr V. Nekrashevych},
     title = {Hyperbolic groupoids: metric and measure},
     journal = {Groups, geometry, and dynamics},
     pages = {883--932},
     year = {2014},
     volume = {8},
     number = {3},
     doi = {10.4171/ggd/252},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/252/}
}