@article{JRAM_1961__206_150469,
     author = {Hans-Egon Richert},
     title = {Zur multiplikativen {Zahlentheorie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {31--38},
     publisher = {mathdoc},
     volume = {206},
     year = {1961},
     zbl = {0106.03304},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1961__206_150469/}
}