TY  - JOUR
AU  - John N. Mather
TI  - Area preserving twist homeomorphism of the annulus.
JO  - Commentarii mathematici Helvetici
PY  - 1979
SP  - 397
EP  - 404
VL  - 54
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1979__54_139793/
ID  - CMH_1979__54_139793
ER  -