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R&D investment: A dynamic efficiency approach in the EU countries . The Economics and Finance Letters, [S. l.], v. 11, n. 3, p. 221–231, 2024. DOI: 10.18488/29.v11i3.3865. Disponível em: https://archive.conscientiabeam.com/index.php/29/article/view/3865. Acesso em: 24 aug. 2026.