Zhang, Pengxin, Shuhan Yang, Shaoqing Dai, Darren How Jin Aik, Shujuan Yang, and Peng Jia. “Global Spreading of Omicron Variant of COVID-19”. Geospatial Health 17, no. s1 (July 13, 2022). Accessed April 28, 2024. https://www.geospatialhealth.net/gh/article/view/1083.