PURBA, R.; LUBIS, R.; SIKANA, N.; SITUMORANG, G. F. BERT Model Implementation for Dynamic Sentiment Analysis of Pertamina on Social Media X. Engineering Science Letter, [S. l.], v. 4, n. 02, p. 77–82, 2025. DOI: 10.56741/IISTR.esl.001139. Disponível em: https://journal.iistr.org/index.php/ESL/article/view/1139. Acesso em: 8 oct. 2026.