@article{AM2_1980__21_182414,
     author = {J. Acz\'el},
     title = {General solution of a system of functional equations satisfied by sums of powers on arithmetic progressions.},
     journal = {Aequationes mathematicae},
     pages = {39--43},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0451.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182414/}
}