TY  - JOUR
AU  - Hass, Joel
AU  - Lagarias, Jeffrey
TI  - The number of Reidemeister moves needed for unknotting
JO  - Journal of the American Mathematical Society
PY  - 2001
SP  - 399
EP  - 428
VL  - 14
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-01-00358-7/
DO  - 10.1090/S0894-0347-01-00358-7
ID  - 10_1090_S0894_0347_01_00358_7
ER  -