XU, Jie. Sources of Cryptocurrency Return Predictability: Econometric and Machine Learning Evidence Across Market States. Frontiers in Business and AI, [S. l.], v. 1, n. 2, p. 1–30, 2026. DOI: 10.68471/fbai.2026.006. Disponível em: https://www.gf-press.com/index.php/FBAI/article/view/22. Acesso em: 13 nov. 2026.