Salim Youns Anas Youns, Anas, أنس, Abdul Ghafoor Salim, and عبد. 2019. “Study of Stability of Non-Linear Model With Hyperbolic Secant Function”. Journal of Education and Science (JES) 28 (1):106-20. https://doi.org/10.33899/edusj.2019.160917.