@article{10_2140_agt_2009_9_593,
     author = {Barnett, Kathryn and Farber, Michael},
     title = {Topology of configuration space of two particles on a graph, {I}},
     journal = {Algebraic and Geometric Topology},
     pages = {593--624},
     year = {2009},
     volume = {9},
     number = {1},
     doi = {10.2140/agt.2009.9.593},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2009.9.593/}
}