Aldawiyah, N.K. et al. 2026. Value-at-Risk Analysis of PT Bukit Asam Tbk (PTBA) Stock Returns Based on an ARIMA–GARCH Model with a Student-t Distribution. Jurnal Matematika, Statistika dan Komputasi. 22, 3 (May 2026), 546–559. DOI:https://doi.org/10.20956/j.v22i3.49505.