%0 Journal Article %A W. Jurkat %A H. Richert %T An improvement of Selberg's sieve method I %J Acta Arithmetica %D 1965 %P 217-240 %V 11 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-11-2-217-240/ %R 10.4064/aa-11-2-217-240 %G en %F 10_4064_aa_11_2_217_240