@article{10_4171_ggd_40,
     author = {Narutaka Ozawa},
     title = {Weak amenability of hyperbolic groups},
     journal = {Groups, geometry, and dynamics},
     pages = {271--280},
     year = {2008},
     volume = {2},
     number = {2},
     doi = {10.4171/ggd/40},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/40/}
}