@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/