1. WHO statement on novel coronavirus in Thailand. https://www.who.int/news/item/13-01-2020-who-statement-on-novel-coronavirus-in-Thailand
2. WHO Director-General’s opening remarks at the Special Session of the World Health Assembly. https://www.who.int/director-general/speeches/detail/who-director-general-s-opening-remarks-at-the-special-session-of-the-world-health-assembly---29-november-2021
3. Omicron Comes to China, Prompting Mass Testing and Quarantines. https://www.wsj.com/articles/omicron-comes-to-china-prompting-mass-testing-and-quarantines-11641736166?reflink=desktopwebshare_permalink
4. The first discovery of variant strain XBB of Omikjon subtype in Tokyo, Japan. http://news.hnr.cn/shxw/article/1/1585624641482739714
5. Ben Hassen, H., Elaoud, A., Ben Salah, N., Masmoudi, A.: A sir-poisson model for COVID-19: evolution and transmission inference in the Maghreb central regions. Arab. J. Sci. Eng. 46(1), 93–102 (2021). https://doi.org/10.1007/s13369-020-04792-0