Xiaowen Zhang and  Wanda Luen-Wun Siu,  Fighting COVID-19: Lessons and Experience from the World’s Largest Economies.   journal   = {International Journal of Medical and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2021, vol. 174(6). 624 - 629
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10012088.