ARI SAPUTRA, A. F.; TRIAYUDI, A. .; ESTI HANDAYANI, E. T. Expert System for Early Detection of Public Anxiety Levels Against Covid-19 with the Comparison Method of Dempster-Shafer and Certainty Factor. Jurnal Mantik, [S. l.], v. 4, n. 3, p. 2127-2134, 2020. DOI: 10.35335/mantik.Vol4.2020.1091.pp2127-2134. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/1091. Acesso em: 20 aug. 2026.