Fawzi AL-Azzawi, S., سعد, K. A. Abed, and کرم. “Using Δ - Discriminate Method to Determine the Stability and Bifurcation of Chen Chaotic System”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 8, no. 2, June 2025, pp. 111-22, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/19604.