Petrov S. Economic Efficiency Assessment of Sustainability Investment in EU Member States: A Data Envelopment Analysis with Crisis Impact Evaluation (2015-2024). Int. J. Econ. Sci. [Internet]. 2026 Apr. 15 [cited 2026 Apr. 15];15(1):406-42. Available from: https://www.ijes-journal.org/journal/article/view/278