Existence of Periodic Solutions for Neutral Nonlinear Dynamic Systems with Delay Using Shift Operators and Krasnoselskii’s Fixed Point Theorem. mjbs [Internet]. 2026 Jan. 8 [cited 2026 Jan. 10];23(3):124-38. Available from: https://mdp.omu.edu.ly/journals/index.php/mjbs/article/view/1416