Zulkarnain, N., Mohammad, N. F., & Shogar, I. (2023). MODIFIED SEIRD MODEL: A NOVEL SYSTEM DYNAMICS APPROACH IN MODELLING THE SPREAD OF COVID-19 IN MALAYSIA DURING THE PRE-VACCINATION PERIOD. IIUM Engineering Journal, 24(2), 159–183. https://doi.org/10.31436/iiumej.v24i2.2550