@article{hal-01408130,
author = {Fran\c coise , Jean-Pierre },
title = {Birkhoff normal forms and analytic geometry},
journal = {HAL},
volume = {1997},
number = {0},
year = {1997},
language = {en},
url = {http://dml.mathdoc.fr/item/hal-01408130}
}
Françoise , Jean-Pierre . Birkhoff normal forms and analytic geometry. HAL, Tome 1997 (1997) no. 0, . http://gdmltest.u-ga.fr/item/hal-01408130/