@article{10_2140_agt_2007_7_439,
     author = {Sikora, Adam and Westbury, Bruce},
     title = {Confluence theory for graphs},
     journal = {Algebraic and Geometric Topology},
     pages = {439--478},
     year = {2007},
     volume = {7},
     number = {1},
     doi = {10.2140/agt.2007.7.439},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2007.7.439/}
}