@article{10_2140_agt_2005_5_237,
     author = {Kaufmann, Ralph M},
     title = {On several varieties of cacti and their relations},
     journal = {Algebraic and Geometric Topology},
     pages = {237--300},
     year = {2005},
     volume = {5},
     number = {1},
     doi = {10.2140/agt.2005.5.237},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2005.5.237/}
}