@article{10_4064_aa_35_1_101_102,
     author = {Riho Terras},
     title = {On the existence of a density},
     journal = {Acta Arithmetica},
     pages = {101--102},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1979},
     doi = {10.4064/aa-35-1-101-102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-35-1-101-102/}
}