@article{10_4171_dm_67,
     author = {Eberhard Kirchberg and Simon Wassermann},
     title = {Permanence properties of $C^*$-exact groups},
     journal = {Documenta mathematica},
     pages = {513--558},
     year = {1999},
     volume = {4},
     doi = {10.4171/dm/67},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/67/}
}