Niazy H. Hussein. “Periodic Solutions Bifurcating From a Curve of Singularity of the Jerk System”. Zanco Journal of Pure and Applied Sciences 32, no. 2 (April 22, 2020): 55–61. Accessed July 22, 2024. https://zancojournal.su.edu.krd/index.php/JPAS/article/view/2204.