YANG, X. H. Analysis of Heterogeneity in Digital Economy Policy Effects Using XGBoost-Causal Tree. Advanced Electromagnetics, [S. l.], v. 15, n. 3, p. 5690–5698, 2026. DOI: 10.7716/aem.v15i3.3621. Disponível em: https://www.aemjournal.org/index.php/AEM/article/view/3621. Acesso em: 8 sep. 2026.