@article{AM2_1978__17_136747,
     author = {Karol Baron and Maciej Sablik},
     title = {On the uniqueness of continuous solutions of a functional equation of n-th order.},
     journal = {Aequationes mathematicae},
     pages = {295--304},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     zbl = {0393.39002},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136747/}
}