@article{AUPO_2012__51_2_a0,
     author = {Abbas, Sa{\"\i}d and Benchohra, Mouffak},
     title = {Upper and {Lower} {Solutions} {Method} for {Darboux} {Problem} for {Fractional} {Order} {Implicit} {Impulsive} {Partial} {Hyperbolic} {Differential} {Equations}},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {5--18},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2012},
     mrnumber = {3058869},
     zbl = {06204926},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2012__51_2_a0/}
}