@article{01779158, title = {On composition of formal power series.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {30}, year = {2002}, pages = {761-770}, doi = {10.1155/S0161171202107150}, zbl = {0998.13010}, language = {en}, url = {http://dml.mathdoc.fr/item/01779158} }
Gan, Xiao-Xiong; Knox, Nathaniel. On composition of formal power series.. International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 761-770. doi : 10.1155/S0161171202107150. http://gdmltest.u-ga.fr/item/01779158/