1. Abbas, S., Agarwal, R.P., Benchohra, M.: Impulsive discontinuous partial hyperbolic differential equations of fractional order on Banach algebras. Electron. J. Differ. Equ. 2010(91), 17
2. Abbas S., Benchohra M.: Partial hyperbolic differential equations with finite delay involving the Caputo fractional derivative. Commun. Math. Anal. 7, 62–72 (2009)
3. Abbas S., Benchohra M.: Impulsive partial hyperbolic functional differential equations of fractional order with state-dependent delay. Frac. Calc. Appl. Anal. 13(3), 225–244 (2010)
4. Abbas S., Benchohra M.: Upper and lower solutions method for impulsive partial hyperbolic differential equations with fractional order. Nonlinear Anal. Hybrid Syst. 4, 604–613 (2010)
5. Abbas S., Benchohra M.: Impulsive partial hyperbolic differential inclusions of fractional order. Demonstratio Math. XLIII 4, 775–797 (2010)