@article{MZ_1980__172_172962,
     author = {Karl-Heinz Indlekofer},
     title = {A {Mean-Value} {Theorem} for {Multiplicative} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {255--272},
     publisher = {mathdoc},
     volume = {172},
     year = {1980},
     zbl = {0416.10035},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__172_172962/}
}