Jafri, F., M. Omar, F. . Kusnin, and M. Mohamad. “COVID-19 Outbreak at an Aged-Care Facility in Selangor, Malaysia, March–April 2020”. Western Pacific Surveillance and Response, vol. 13, no. 1, Jan. 2022, p. 5, doi:10.5365/wpsar.2022.13.1.839.