1. Agarwal, R.P., Awan, A.S., ÓRegan, D., Younus, A.: Linear impulsive Volterra integro–dynamic system on time scales. Adv. Differ. Equ. 2014(6), 1–17 (2014)
2. Ali, Z., Zada, A., Shah, K.: Ulam stability to a toppled systems of nonlinear implicit fractional order boundary value problem. Bound. Value Probl. 2018(175), 1–16 (2018)
3. Ali, Z., Zada, A., Shah, K.: On Ulam’s stability for a coupled systems of nonlinear implicit fractional differential equations. Bull. Malays. Math. Sci. Soc. 42, 2681–2699 (2019)
4. Alsina, C., Ger, R.: On some inequalities and stability results related to the exponential function. J. Inequal. Appl. 2, 373–380 (1998)
5. András, S., Mészáros, A.R.: Ulam-Hyers stability of dynamic equations on time scales via Picard operators. Appl. Math. Comput. 219(9), 4853–4864 (2013)