Viny Gilang Ramadhan, and Yuliant Sibaroni. “Sentiment Analysis of Public Opinion Related to Rapid Test Using LDA Method”. Jurnal RESTI (Rekayasa Sistem Dan Teknologi Informasi), Vol. 5, no. 4, Aug. 2021, pp. 672 -79, doi:10.29207/resti.v5i4.3139.