Jehan Mohammed Al-Ameri. “Cubic Spline Interpolation for Data Infections of COVID-19 Pandemic in Iraq”. Al-Qadisiyah Journal of Pure Science 26, no. 5 (November 12, 2021): Math 23-32. Accessed May 20, 2024. https://journalsc.qu.edu.iq/index.php/JOPS/article/view/1443.