@article{GDZPPN002034107, title = {Two iterative functional equations for power series.}, journal = {Aequationes mathematicae}, volume = {25}, year = {1982}, pages = {233-246}, zbl = {0526.39009}, url = {http://dml.mathdoc.fr/item/GDZPPN002034107} }
Gronau, Detlef. Two iterative functional equations for power series.. Aequationes mathematicae, Tome 25 (1982) pp. 233-246. http://gdmltest.u-ga.fr/item/GDZPPN002034107/