@article{1077477217, author = {Bellman, Richard}, title = {The iteration of power series in two variables}, journal = {Duke Math. J.}, volume = {19}, number = {1}, year = {1952}, pages = { 339-347}, language = {en}, url = {http://dml.mathdoc.fr/item/1077477217} }
Bellman, Richard. The iteration of power series in two variables. Duke Math. J., Tome 19 (1952) no. 1, pp. 339-347. http://gdmltest.u-ga.fr/item/1077477217/