Zhu, Liqiao, Yifeng Peng, Lancong Xie, and Yiwen Chen. “Research of the Spread of Covid-19 in World Wide and Particular Countries”. Transactions on Materials, Biotechnology and Life Sciences 3 (March 24, 2024): 498–505. Accessed August 8, 2026. https://wepub.org/index.php/TMBLS/article/view/938.