TY - JOUR AU - Ahmad, Bashir AU - Ntouyas, Sotiris TI - A study of second order differential inclusions with four-point integral boundary conditions JO - Discussiones Mathematicae. Differential Inclusions, Control and Optimization PY - 2011 SP - 137 EP - 156 VL - 31 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DMDICO_2011_31_2_a0/ LA - en ID - DMDICO_2011_31_2_a0 ER -