%0 Journal Article
%A W. D.  Evans
%A D. J. Harris
%A J. Lang
%T Two-sided estimates for the approximation numbers of Hardy-type operators in $L^{∞}$ and L¹
%J Studia Mathematica
%D 1998
%P 171-192
%V 130
%N 2
%U http://geodesic.mathdoc.fr/articles/10.4064/sm_1998_130_2_1_171_192/
%R 10.4064/sm_1998_130_2_1_171_192
%G en
%F 10_4064_sm_1998_130_2_1_171_192