%0 Journal Article
%A Liqing Zhang
%T Two-sided approximation to periodic solutions of ordinary differential equations.
%J Numerische Mathematik
%D 1993
%P 399-410
%V 66
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NUMA_1993__66_3_133769/
%F NUMA_1993__66_3_133769