%0 Journal Article %A Stanisław Knapowski %T Contributions to the theory of the distribution of prime numbers in arithmetical progressions II %J Acta Arithmetica %D 1961 %P 325-335 %V 7 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-7-4-325-335/ %R 10.4064/aa-7-4-325-335 %G en %F 10_4064_aa_7_4_325_335