Cost-effective Public Opinion Monitoring and Analysis Method and Device. Journal of Informatics Education and Research, [S. l.], v. 3, n. 1, 2023. DOI: 10.52783/jier.v3i2.1645. Disponível em: https://jier.org/index.php/journal/article/view/1645. Acesso em: 15 may. 2026.