@article{MAN_1961__143_160852,
     author = {E. Wirsing},
     title = {Das asymptotische {Verhalten} von {Summen} \"uber multiplikative {Funktionen.}},
     journal = {Mathematische Annalen},
     pages = {75--102},
     year = {1961},
     volume = {143},
     zbl = {0104.04201},
     url = {http://geodesic.mathdoc.fr/item/MAN_1961__143_160852/}
}