%0 Journal Article
%A Gao, Haiyin
%A Weng, Shiyou
%A Jiang, Daqing
%A Hou, Xuezhang
%T On second order periodic boundary-value problems with upper and lower solutions in the reversed order
%J Electronic Journal of Differential Equations
%D 2006
%V 2006
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a191/
%G en
%F EJDE_2006__2006__a191