TY  - JOUR
AU  - Calegari, Danny
TI  - Stable commutator length is rational in free groups
JO  - Journal of the American Mathematical Society
PY  - 2009
SP  - 941
EP  - 961
VL  - 22
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-09-00634-1/
DO  - 10.1090/S0894-0347-09-00634-1
ID  - 10_1090_S0894_0347_09_00634_1
ER  -