@article{JIS_2006__9_3_a2,
     author = {Cobeli, C. and Zaharescu, A.},
     title = {On the {Farey} fractions with denominators in arithmetic progression},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2006__9_3_a2/}
}