@article{GDZPPN002033100, title = {Functions satisfying a discrete mean value property.}, journal = {Aequationes mathematicae}, volume = {22}, year = {1981}, pages = {173-193}, zbl = {0486.31005}, url = {http://dml.mathdoc.fr/item/GDZPPN002033100} }
Flatto, L.; Jacobson, D. Functions satisfying a discrete mean value property.. Aequationes mathematicae, Tome 22 (1981) pp. 173-193. http://gdmltest.u-ga.fr/item/GDZPPN002033100/