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@article{AM2_1982__25_136966, author = {Detlef Gronau}, title = {Two iterative functional equations for power series.}, journal = {Aequationes mathematicae}, pages = {233--246}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0526.39009}, url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136966/} }
Detlef Gronau. Two iterative functional equations for power series.. Aequationes mathematicae, Tome 25 (1982), pp. 233-246. http://geodesic.mathdoc.fr/item/AM2_1982__25_136966/