Najiyah I, Hariyanti I. SENTIMEN ANALISIS COVID-19 DENGAN METODE PROBABILISTIC NEURAL NETWORK DAN TF-IDF. j. responsif ris. sains inform. [Internet]. 2021 Feb. 28 [cited 2026 Sep. 17];3(1):100-11. Available from: https://ejurnal.ars.ac.id/index.php/jti/article/view/488