E. D. Agustono, D. Sianturi, A. Taufik, and W. Gata, “ANALISIS SENTIMEN TERHADAP WARGA CHINA SAAT PANDEMI DENGANALGORITMATERM FREQUENCY-INVERSE DOCUMENT FREQUENCY DAN SUPPORT VECTOR MACHINE”, JIRE, vol. 3, no. 2, pp. 111–119, Nov. 2020.