@article{10_2140_agt_2010_10_215,
     author = {Calegari, Danny},
     title = {Quasimorphisms and laws},
     journal = {Algebraic and Geometric Topology},
     pages = {215--217},
     year = {2010},
     volume = {10},
     number = {1},
     doi = {10.2140/agt.2010.10.215},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2010.10.215/}
}