@article{10_4064_aa_34_3_183_196,
     author = {K. Wiertelak},
     title = {On the density of some sets of primes, {I}},
     journal = {Acta Arithmetica},
     pages = {183--196},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1977},
     doi = {10.4064/aa-34-3-183-196},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-34-3-183-196/}
}