BUTRIS, R. N.; RAFEEQ, A. S.; FARIS, H. S. Existence, Uniqueness and Stability of Periodic Solution for Nonlinear System of Integro-Differential Equations. Science Journal of University of Zakho, [S. l.], v. 5, n. 1, p. 120–127, 2017. DOI: 10.25271/2017.5.1.312. Disponível em: https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/474. Acesso em: 26 apr. 2024.