TY - JOUR AU - Ji, Caisheng AU - Yan, Baoqiang TI - Positive solutions for second-order singular three-point boundary-value problems with sign-changing nonlinearities JO - Electronic journal of differential equations PY - 2010 VL - 2010 UR - http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a12/ LA - en ID - EJDE_2010__2010__a12 ER -