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@article{MAN_1993__297_3_165124, author = {W. Hansen and N. Nadirashvili}, title = {Mean values and harmonic functions.}, journal = {Mathematische Annalen}, pages = {157--170}, publisher = {mathdoc}, volume = {297}, number = {3}, year = {1993}, zbl = {0794.31002}, url = {http://geodesic.mathdoc.fr/item/MAN_1993__297_3_165124/} }
W. Hansen; N. Nadirashvili. Mean values and harmonic functions.. Mathematische Annalen, Tome 297 (1993) no. 3, pp. 157-170. http://geodesic.mathdoc.fr/item/MAN_1993__297_3_165124/