@article{10_4064_aa_7_4_325_335,
     author = {Stanis{\l}aw Knapowski},
     title = {Contributions to the theory of the distribution of prime numbers in arithmetical progressions {II}},
     journal = {Acta Arithmetica},
     pages = {325--335},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1961},
     doi = {10.4064/aa-7-4-325-335},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-7-4-325-335/}
}