HUTAPEA, R. O.; SINAGA, G. T.; SIANTURI, A. A. Integrating garch, markowitz mean–variance, and lstm for risk, volatility, and portfolio analysis of four major Indonesian banking stocks 2015 – 2024. Economic: Journal Economic and Business, [S. l.], v. 5, n. 1, p. 15–26, 2026. DOI: 10.56495/ejeb.v5i1.1401. Disponível em: https://jurnal.larisma.or.id/index.php/EJEB/article/view/1401. Acesso em: 2 jan. 2026.