@article{10_4171_ggd_156,
     author = {Itai Benjamini and Sebastian M\"uller},
     title = {On the trace of branching random walks},
     journal = {Groups, geometry, and dynamics},
     pages = {231--247},
     year = {2012},
     volume = {6},
     number = {2},
     doi = {10.4171/ggd/156},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/156/}
}