@article{CMH_1972__47_139511,
     author = {Henri Joris},
     title = {...-S\"atze f\"ur zwei arithmetische {Funktionen}},
     journal = {Commentarii mathematici Helvetici},
     pages = {220--248},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0248.12009},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139511/}
}