@article{10_4171_ggd_60,
     author = {Andreas Thom},
     title = {Low degree bounded cohomology and $L^2$-invariants for negatively curved groups},
     journal = {Groups, geometry, and dynamics},
     pages = {343--358},
     year = {2009},
     volume = {3},
     number = {2},
     doi = {10.4171/ggd/60},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/60/}
}