Analysis of public opinion sentiment against COVID-19 in Indonesia on twitter using the k-nearest neighbor algorithm and decision tree. J. Soft Comput. Explor. [інтернет]. 30, Вересень 2022 [цит. за 25, Серпень 2026];3(2):117-22. доступний у: https://shmpublisher.com/index.php/joscex/article/view/88