@article{GDZPPN002423723, title = {A Mean-Value Theorem for Multiplicative Functions.}, journal = {Mathematische Zeitschrift}, volume = {174}, year = {1980}, pages = {255-272}, zbl = {0416.10035}, url = {http://dml.mathdoc.fr/item/GDZPPN002423723} }
Indlekofer, Karl-Heinz. A Mean-Value Theorem for Multiplicative Functions.. Mathematische Zeitschrift, Tome 174 (1980) pp. 255-272. http://gdmltest.u-ga.fr/item/GDZPPN002423723/