%0 Journal Article %A E. Cohen %T Arithmetical functions associated with arbitrary sets of integers %J Acta Arithmetica %D 1959 %P 407-415 %V 5 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-5-4-407-415/ %R 10.4064/aa-5-4-407-415 %G en %F 10_4064_aa_5_4_407_415