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. [اینترنت]. 30 سپتامبر 2022 [ارجاع شده 25 آگوست 2026];3(2):117-22. قابل دسترس در: https://shmpublisher.com/index.php/joscex/article/view/88