TY  - JOUR
AU  - Nguyen Tien Zung
TI  - Convergence versus integrability in Birkhoff normal form
JO  - Annals of mathematics
PY  - 2005
SP  - 141
EP  - 156
VL  - 161
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4007/annals.2005.161.141/
DO  - 10.4007/annals.2005.161.141
LA  - en
ID  - 10_4007_annals_2005_161_141
ER  -