Research on the Mechanism Test and Spatial Optimization of Digital Economy driving the Improvement of New Quality Productivity in Hebei Province. Journal of the European Academy Open University, [S. l.], v. 1, n. 5, 2025. DOI: 10.71411/eaou.2025.v1i5.1007. Disponível em: https://ojs.shiharr.com/index.php/eaou/article/view/1007. Acesso em: 30 jan. 2026.