TY - JOUR AU - Dhage, Bupurao AU - Petruşel, Adrian TI - The method of upper and lower solutions for perturbed nth order differential inclusions JO - Discussiones Mathematicae. Differential Inclusions, Control and Optimization PY - 2006 SP - 57 EP - 76 VL - 26 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DMDICO_2006_26_1_a1/ LA - en ID - DMDICO_2006_26_1_a1 ER -