%0 Journal Article
%A Yingchun Cai
%A Minggao Lu
%T On the upper bound for $\pi _{2}(x)$
%J Acta Arithmetica
%D 2003
%P 275-298
%V 110
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/aa110-3-6/
%R 10.4064/aa110-3-6
%G en
%F 10_4064_aa110_3_6