%0 Journal Article %A Xiaoping Xu %T A Cubic E6-Generalization of the Classical Theorem on Harmonic Polynomials %J Journal of Lie Theory %D 2011 %P 145-164 %V 21 %N 1 %U http://geodesic.mathdoc.fr/item/JOLT_2011_21_1_a6/ %F JOLT_2011_21_1_a6