@article{AM2_1982__24_136935,
     author = {Carl C. Cowen},
     title = {Analytic solutions of {B\"ottcher's} functional equation in  the unit disk.},
     journal = {Aequationes mathematicae},
     pages = {187--194},
     publisher = {mathdoc},
     volume = {24},
     year = {1982},
     zbl = {0526.30033},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__24_136935/}
}