@article{10_4064_aa_25_2_191_197,
     author = {H. Meijer},
     title = {On the upper asymptotic density of (0, r)-primitive sequences},
     journal = {Acta Arithmetica},
     pages = {191--197},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1973},
     doi = {10.4064/aa-25-2-191-197},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-25-2-191-197/}
}