TY - JOUR AU - Li, Haitao AU - Kong, Xiangshan AU - Yu, Changtian TI - Existence of three non-negative solutions for a three-point boundary-value problem of nonlinear fractional differential equations JO - Electronic Journal of Differential Equations PY - 2012 VL - 2012 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a86/ LA - en ID - EJDE_2012__2012__a86 ER -