Cheng, Z, L Lv, and J Liu. “INVESTIGATING POSITIVE PERIODIC SOLUTIONS IN SUPERLINEAR FIRST-ORDER DIFFERENTIAL SYSTEMS THROUGH GLOBAL BIFURCATION THEORY”. International Journal of Interdisciplinary Research in Statistics, Mathematics and Engineering (IJIRSME) 9, no. 2 (August 3, 2023): 13–22. Accessed March 14, 2025. https://sadijournals.org/index.php/IJIRSME/article/view/170.