Darmawan, Matthew Axel, et al. “VAR Model Estimation And Application Of IRF And FEVD On Currency Exchange Rates, COVID-19 Cases, And WHO Twitter Information In Southeast Asia”. (IJCSAM) International Journal of Computing Science and Applied Mathematics, vol. 10, no. 2, Aug. 2025, pp. 56-63, doi:10.12962/j24775401.ijcsam.v10i2.4554.