Hasanah NA, Suciati N, Purwitasari D. Identifying Degree-of-Concern on COVID-19 topics with text classification of Twitters. regist. j. ilm. teknol. sist. inf. [Internet]. 2021 Feb. 16 [cited 2024 Apr. 27];7(1):50-62. Available from: https://journal.unipdu.ac.id/index.php/register/article/view/2234