Ding, Yongmei, Liyuan Gao, and Ning-Yi Shao. “Non-Linear Link Between Temperature Difference and COVID-19: Excluding the Effect of Population Density”. The Journal of Infection in Developing Countries 15, no. 02 (March 7, 2021): 230–236. Accessed April 24, 2024. https://jidc.org/index.php/journal/article/view/33690205.