@article{DMDICO_2006_26_1_a1,
     author = {Dhage, Bupurao and Petru\c{s}el, Adrian},
     title = {The method of upper and lower solutions for perturbed nth order differential inclusions},
     journal = {Discussiones Mathematicae. Differential Inclusions, Control and Optimization},
     pages = {57--76},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2006},
     zbl = {1139.34005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMDICO_2006_26_1_a1/}
}