TY - JOUR AU - Xu, Fuyi AU - Chen, Zhenbo AU - Xu, Feng TI - Multiple positive solutions for nonlinear second-order m-point boundary-value problems with sign changing nonlinearities JO - Electronic Journal of Differential Equations PY - 2008 VL - 2008 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a61/ LA - en ID - EJDE_2008__2008__a61 ER -