TY  - JOUR
AU  - John N. Mather
TI  - Concavity of the Lagrangian for quasi-periodic orbits.
JO  - Commentarii mathematici Helvetici
PY  - 1982
SP  - 356
EP  - 376
VL  - 57
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1982__57_139912/
ID  - CMH_1982__57_139912
ER  -