Evidence-Calibrated RAG for Unanswerable Question Answering: Retrieval Coverage, Abstention Calibration, and Hallucination-Proxy Analysis on SQuAD 2.0. Journal of Technology Informatics and Engineering, [S. l.], v. 4, n. 2, p. 502–520, 2025. DOI: 10.51903/jtie.v4i2.536. Disponível em: https://jtie.stekom.ac.id/index.php/jtie/article/view/536. Acesso em: 2 jul. 2026.