@article{10_4064_ap_24_2_233_240,
     author = {Marek Kuczma and W. Smajdor},
     title = {On the radius of convergence of series solutions of a functional equation},
     journal = {Annales Polonici Mathematici},
     pages = {233--240},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {1970},
     doi = {10.4064/ap-24-2-233-240},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-24-2-233-240/}
}