@article{JEMS_2007_9_4_a7,
     author = {Ivan Dynnikov and Bert Wiest},
     title = {On the complexity of braids},
     journal = {Journal of the European Mathematical Society},
     pages = {801--840},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2007},
     doi = {10.4171/jems/98},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/98/}
}