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@article{MS2_1968__22_166051, author = {E.M. Horadam}, title = {Ramanujan's {Sum} and {Nagell's} {Totient} {Functio} for {Arithmetical} {Semi-Groups.}}, journal = {Mathematica Scandinavica}, pages = {269--281}, publisher = {mathdoc}, volume = {22}, year = {1968}, zbl = {0182.37601}, url = {http://geodesic.mathdoc.fr/item/MS2_1968__22_166051/} }
E.M. Horadam. Ramanujan's Sum and Nagell's Totient Functio for Arithmetical Semi-Groups.. Mathematica Scandinavica, Tome 22 (1968), pp. 269-281. http://geodesic.mathdoc.fr/item/MS2_1968__22_166051/