Salim Youns Anas Youns A, Ghafoor Salim A. Study of Stability of Non-linear Model with Hyperbolic Secant Function. JES [Internet]. 2019 Mar. 1 [cited 2025 Sep. 10];28(1):106-20. Available from: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41595