@article{AM2_1981__23_136920,
     author = {Carl C. Cowen},
     title = {Analytic solutions of {B\"ottcher's} functional equation in the unit disk. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {317--318},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/AM2_1981__23_136920/}
}