Hasanah, N.A., Suciati, N. and Purwitasari, D. 2021. Identifying Degree-of-Concern on COVID-19 topics with text classification of Twitters. Register: Jurnal Ilmiah Teknologi Sistem Informasi. 7, 1 (Feb. 2021), 50–62. DOI:https://doi.org/10.26594/register.v7i1.2234.