@article{GDZPPN002354454, title = {Harmonic and polyharmonic degeneracy.}, journal = {Mathematica Scandinavica}, volume = {40}, year = {1977}, pages = {288-292}, zbl = {0367.31003}, url = {http://dml.mathdoc.fr/item/GDZPPN002354454} }
Sario, L.; Chung, L.O.; Wang, C. Harmonic and polyharmonic degeneracy.. Mathematica Scandinavica, Tome 40 (1977) pp. 288-292. http://gdmltest.u-ga.fr/item/GDZPPN002354454/