TY - JOUR AU - Jean Fromentin TI - Every braid admits a short sigma-definite expression JO - Journal of the European Mathematical Society PY - 2011 SP - 1591 EP - 1631 VL - 13 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4171/jems/289/ DO - 10.4171/jems/289 ID - JEMS_2011_13_6_a2 ER -