@article{JRAM_1968__231_150866,
     author = {Harald Scheid},
     title = {Arithmetische {Funktionen} \"uber {Halbordnungen.} {I.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {192--214},
     publisher = {mathdoc},
     volume = {231},
     year = {1968},
     zbl = {0162.06203},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1968__231_150866/}
}