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. [Интернет]. 30 сентябрь 2022 г. [цитируется по 25 август 2026 г.];3(2):117-22. доступно на: https://shmpublisher.com/index.php/joscex/article/view/88