@article{10_2140_agt_2008_8_849,
     author = {Kim, Sang-hyun},
     title = {Co-contractions of graphs and right-angled {Artin} groups},
     journal = {Algebraic and Geometric Topology},
     pages = {849--868},
     year = {2008},
     volume = {8},
     number = {2},
     doi = {10.2140/agt.2008.8.849},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2008.8.849/}
}