Hadeed, Iman, and Hussain Mohamad. “A Mathematical Approach to Oscillation of a Discrete Hematopoiesis Model With Positive and Negative Coefficients”. Ibn AL-Haitham Journal For Pure and Applied Sciences 37, no. 3 (July 20, 2024): 386–395. Accessed July 24, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/3432.