@article{10_4064_aa134_1_7,
     author = {D. E. Welch},
     title = {Farey fractions with prime denominators},
     journal = {Acta Arithmetica},
     pages = {93--99},
     publisher = {mathdoc},
     volume = {134},
     number = {1},
     year = {2008},
     doi = {10.4064/aa134-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa134-1-7/}
}