@article{MZ_1976__146_172313,
     author = {Karl-Heinz Indlekofer},
     title = {On {Sets} {Characterizing} {Additive} {Arithmetical} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {285--290},
     year = {1976},
     volume = {146},
     zbl = {0303.10051},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__146_172313/}
}