PETROV, Stefan. Economic Efficiency Assessment of Sustainability Investment in EU Member States: A Data Envelopment Analysis with Crisis Impact Evaluation (2015-2024). International Journal of Economic Sciences, [S. l.], v. 15, n. 1, p. 406–442, 2026. DOI: 10.31181/ijes1512026278. Disponível em: https://www.ijes-journal.org/journal/article/view/278. Acesso em: 15 apr. 2026.