%0 Journal Article
%A E.M. Horadam
%T Ramanujan's Sum and Nagell's Totient Functio for Arithmetical Semi-Groups.
%J Mathematica Scandinavica
%D 1968
%P 269-281
%V 22
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1968__22_166051/
%F MS2_1968__22_166051