@article{GDZPPN002213265,
title = {Restricted mean value property for positive functions.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {475},
year = {1996},
pages = {89-108},
zbl = {0837.31001},
url = {http://dml.mathdoc.fr/item/GDZPPN002213265}
}
Hansen, W.; Nadirashvili, N. Restricted mean value property for positive functions.. Journal für die reine und angewandte Mathematik, Tome 475 (1996) pp. 89-108. http://gdmltest.u-ga.fr/item/GDZPPN002213265/