@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/