1. Kolmanovskii, V., and Myshkis, A. (2013). Introduction to the Theory and Applications of Functional Differential Equations, Springer Science & Business Media.
2. Hilfer, R. (2000). Applications of Fractional Calculus in Physics, World Scientific.
3. Engel, K.J., and Nagel, R. (2001). One-Parameter Semigroups for Linear Evolution Equations, Springer.
4. Diekmann, O., Van Gils, S.A., Lunel, S.M., and Walther, H.O. (2012). Delay Equations: Functional-, Complex-, and Nonlinear Analysis, Springer Science & Business Media.
5. A note on the mild solutions of Hilfer impulsive fractional differential equations;Sousa;Chaos Solitons Fractals,2021