@article{10_4064_aa_70_2_149_159,
     author = {Masayoshi Hata},
     title = {Farey fractions and sums over coprime pairs},
     journal = {Acta Arithmetica},
     pages = {149--159},
     publisher = {mathdoc},
     volume = {70},
     number = {2},
     year = {1995},
     doi = {10.4064/aa-70-2-149-159},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-70-2-149-159/}
}