@article{1028990180, author = {Friedman, Avner}, title = {Mean-values and polyharmonic polynomials.}, journal = {Michigan Math. J.}, volume = {4}, number = {2}, year = {1957}, pages = { 67-74}, language = {en}, url = {http://dml.mathdoc.fr/item/1028990180} }
Friedman, Avner. Mean-values and polyharmonic polynomials.. Michigan Math. J., Tome 4 (1957) no. 2, pp. 67-74. http://gdmltest.u-ga.fr/item/1028990180/