@article{1077468479,
author = {Cronin, Jane},
title = {Note to Poincar\'e's perturbation method},
journal = {Duke Math. J.},
volume = {26},
number = {1},
year = {1959},
pages = { 251-262},
language = {en},
url = {http://dml.mathdoc.fr/item/1077468479}
}
Cronin, Jane. Note to Poincaré’s perturbation method. Duke Math. J., Tome 26 (1959) no. 1, pp. 251-262. http://gdmltest.u-ga.fr/item/1077468479/