%0 Journal Article
%A Liao,  Fang-Fang
%T Periodic orbits with small angular momentum for singular radially symmetric systems
%J Electronic journal of differential equations
%D 2014
%V 2014
%U http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a153/
%G en
%F EJDE_2014__2014__a153