@article{GDZPPN002022036,
title = {General and Regular Solutions of Functional Equations Characterizing Harmonic Polynomials.},
journal = {Aequationes mathematicae},
volume = {1},
year = {1968},
pages = {37-53},
zbl = {0157.46102},
url = {http://dml.mathdoc.fr/item/GDZPPN002022036}
}
Haruki, H.; Aczél, J.; McKiernan, M.A. General and Regular Solutions of Functional Equations Characterizing Harmonic Polynomials.. Aequationes mathematicae, Tome 1 (1968) pp. 37-53. http://gdmltest.u-ga.fr/item/GDZPPN002022036/