%0 Journal Article %A Li, Haitao %A Kong, Xiangshan %A Yu, Changtian %T Existence of three non-negative solutions for a three-point boundary-value problem of nonlinear fractional differential equations %J Electronic Journal of Differential Equations %D 2012 %V 2012 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a86/ %G en %F EJDE_2012__2012__a86