Zaharia, Marian, Rodica-Manuela Gogonea, and Aniela Balacescu. “Education Efficiency, Factor of Sustainable Development. An Analysis in Macro 4 Development Region of Romania”. LUMEN Proceedings 13 (August 11, 2020): 1-9. Accessed November 12, 2026. https://proceedings.lumenpublishing.com/ojs/index.php/lumenproceedings/article/view/312.