@article{GDZPPN002036908,
title = {A functioanl identity characterizing polynomials.},
journal = {Aequationes mathematicae},
volume = {33},
year = {1987},
pages = {147-152},
zbl = {0633.39005},
url = {http://dml.mathdoc.fr/item/GDZPPN002036908}
}
Cross, G.E.; Kannappan, Pl. A functioanl identity characterizing polynomials.. Aequationes mathematicae, Tome 33 (1987) pp. 147-152. http://gdmltest.u-ga.fr/item/GDZPPN002036908/