Nurkholis, A. et al. 2022. Comparison of Kernel Support Vector Machine Multi-Class in PPKM Sentiment Analysis on Twitter. Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi). 6, 2 (Apr. 2022), 227–233. DOI:https://doi.org/10.29207/resti.v6i2.3906.