1. Lakshmikantham, V., Bainov, D., Simeonov, P.: Theory of Impulsive Differential Equations. World Scientific, Singapore (1989)
2. Bainov, D., Simenov, P.: Impulsive Differential Equations: Periodic Solution and Application. Longman Scientific and Technical Harlow, Harlow (1993)
3. Podlubny, I.: Fractional Differential Equations. Academic Press, New York (1999)
4. Diethelm, K.: The Analysis of Fractional Differential Equations. Springer, New York (2004)
5. Kilbas, A., Srivastava, H., Trujillo, J.: Theory and Applications of Fractional Differential Equations. Elsevier, Amsterdam (2006)