@article{10_4064_ap_21_2_217_221,
     author = {L. Anczyk},
     title = {On differentiable solutions of {B\"ottcher's} functional equation},
     journal = {Annales Polonici Mathematici},
     pages = {217--221},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1968},
     doi = {10.4064/ap-21-2-217-221},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-21-2-217-221/}
}