@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/