Gr. Margaritis, Stylianos. “Evaluation of Upper Secondary Schools on Efficiency and Productivity Change in 2016-2019: Empirical Evidence from Schools in the Region in Central Greece”. SPOUDAI Journal of Economics and Business 71, no. 3-4 (April 15, 2021): 101–121. Accessed October 22, 2024. http://spoudai.org/index.php/journal/article/view/100.