A. Makhzoum, Haitham, and Rafik A. Elmansouri. “The Existence and Uniqueness of Periodic Solutions for Nonlinear Neutral First Order Differential Equation With Functional Delay”. Libyan Journal of Science &Technology 7, no. 2 (September 18, 2022). Accessed April 27, 2025. https://journals.uob.edu.ly/LJST/article/view/2377.