@article{AM2_1982__25_136977,
     author = {Detlef Gronau},
     title = {Two iterative functional equations for power series. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {318--319},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0526.39009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136977/}
}