@article{10_2140_agt_2011_11_2547,
     author = {Papasoglu, Panos and Swenson, Eric},
     title = {The cactus tree of a metric space},
     journal = {Algebraic and Geometric Topology},
     pages = {2547--2578},
     year = {2011},
     volume = {11},
     number = {5},
     doi = {10.2140/agt.2011.11.2547},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2011.11.2547/}
}