@article{10_2140_agt_2005_5_1075,
     author = {Farley, Daniel and Sabalka, Lucas},
     title = {Discrete {Morse} theory and graph braid groups},
     journal = {Algebraic and Geometric Topology},
     pages = {1075--1109},
     year = {2005},
     volume = {5},
     number = {3},
     doi = {10.2140/agt.2005.5.1075},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2005.5.1075/}
}