@article{GDZPPN002338564,
title = {Mean values and harmonic functions.},
journal = {Mathematische Annalen},
volume = {295},
year = {1993},
pages = {157-170},
zbl = {0794.31002},
url = {http://dml.mathdoc.fr/item/GDZPPN002338564}
}
Hansen, W.; Nadirashvili, N. Mean values and harmonic functions.. Mathematische Annalen, Tome 295 (1993) pp. 157-170. http://gdmltest.u-ga.fr/item/GDZPPN002338564/