@article{10_4064_aa_19_2_175_184,
     author = {R. Hall},
     title = {On the probability that n and f (n) are relatively prime {II}},
     journal = {Acta Arithmetica},
     pages = {175--184},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1971},
     doi = {10.4064/aa-19-2-175-184},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-19-2-175-184/}
}