Ding, Yongmei, and Lingxiao Xiang. “A Data Driven Study on the Variant of Covid-19 in Hong Kong”. International Journal of Statistics in Medical Research 11 (September 5, 2022): 51–58. Accessed November 23, 2024. https://lifescienceglobal.com/pms/index.php/ijsmr/article/view/8798.