@article{GDZPPN002338556, title = {Inverse mean value property of harmonic functions.}, journal = {Mathematische Annalen}, volume = {295}, year = {1993}, pages = {147-156}, zbl = {0794.31001}, url = {http://dml.mathdoc.fr/item/GDZPPN002338556} }
Hansen, W.; Netuka, I. Inverse mean value property of harmonic functions.. Mathematische Annalen, Tome 295 (1993) pp. 147-156. http://gdmltest.u-ga.fr/item/GDZPPN002338556/