@article{BUMI_2003_8_6B_2_a14,
     author = {Codec\'a, P. and Nair, M.},
     title = {Links between $\Delta(x,N) = {\displaystyle \sum_{{n \leq xN, \,\, (n,N)=1}}} 1-x\phi(N)$ and character sums},
     journal = {Bollettino della Unione matematica italiana},
     pages = {509--516},
     publisher = {mathdoc},
     volume = {Ser. 8, 6B},
     number = {2},
     year = {2003},
     zbl = {1177.11079},
     mrnumber = {1637673},
     language = {it},
     url = {https://geodesic-test.mathdoc.fr/item/BUMI_2003_8_6B_2_a14/}
}