Existence of Periodic Solutions for Neutral Nonlinear Dynamic Systems with Delay Using Shift Operators and Krasnoselskii’s Fixed Point Theorem. Al-Mukhtar Journal of Basic Sciences, [S. l.], p. 01–15, 2025. DOI: 10.54172/rjkmxv77. Disponível em: https://mdp.omu.edu.ly/journals/index.php/mjbs/article/view/1416. Acesso em: 19 nov. 2025.