@article{10_2140_agt_2003_3_873,
     author = {Tuffley, Christopher},
     title = {Finite subset spaces of graphs and punctured surfaces},
     journal = {Algebraic and Geometric Topology},
     pages = {873--904},
     year = {2003},
     volume = {3},
     number = {2},
     doi = {10.2140/agt.2003.3.873},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2003.3.873/}
}