@article{GDZPPN002284707,
title = {Dirichlet Problem for n-Harmonic Functions and Related Geometrical Properties.},
journal = {Mathematische Annalen},
volume = {129},
year = {1955},
pages = {202-218},
zbl = {0067.33004},
url = {http://dml.mathdoc.fr/item/GDZPPN002284707}
}
Rizza, G.B. Dirichlet Problem for n-Harmonic Functions and Related Geometrical Properties.. Mathematische Annalen, Tome 129 (1955) pp. 202-218. http://gdmltest.u-ga.fr/item/GDZPPN002284707/