@article{MOMA_1966__70_177327,
     author = {K. Nageswara Rao},
     title = {On the {Unitary} {Analogues} of {Certain} {Totients.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {149--154},
     publisher = {mathdoc},
     volume = {70},
     year = {1966},
     zbl = {0139.27001},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1966__70_177327/}
}