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@article{PORMA_1951__10_1_114493, author = {Protter, M.H.}, title = {On a class of harmonic polynomials}, journal = {Portugaliae mathematica}, pages = {11--22}, publisher = {mathdoc}, volume = {10}, number = {1}, year = {1951}, mrnumber = {0041993}, zbl = {0043.07302}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1951__10_1_114493/} }
Protter, M.H. On a class of harmonic polynomials. Portugaliae mathematica, Tome 10 (1951) no. 1, pp. 11-22. http://geodesic.mathdoc.fr/item/PORMA_1951__10_1_114493/