1. Agrawal, O., Tenreiro Machado, J., Sabatier, J.: Fractional Derivatives and Their Applications, Nonlinear Dynamics. Springer-Verlag, Berlin (2004)
2. Agarwal, R., Hristova, S., Oregan, D.: Iterative techniques for the initial value problem for Caputo fractional differential equations with non-instantaneous impulses. Appl. Math. Comput. 334, 407–421 (2018)
3. Ahmad, B., Luca, R.: Existence of solutions for sequential integro-differential equations and inclusins with nonlocal boundary conditions. Appl. Math. Comput. 339, 516–538 (2018)
4. Chen, G., He, Z.: Infinitely many homoclinic solutions for a class of second order Hamiltonian systems. Adv. Differ. Equ. 2014(161), 1–15 (2014)
5. Chen, G., Zhang, L.: Infinitely many homoclinic solutions for perturbed second-order Hamiltonian systems with subquadratic potentials. Electr. J. Qual. Theo. Diff. Eq. 2020(9), 1–23 (2020)