TY - JOUR AU - Ferrara, Massimiliano AU - Hadjian, Armin TI - Variational approach to fractional boundary value problems with two control parameters JO - Electronic journal of differential equations PY - 2015 VL - 2015 UR - http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a40/ LA - en ID - EJDE_2015__2015__a40 ER -