YOUSFAT, A.; BAHAJI, . K.; SAWS, S. Efficiency Evaluation of European Countries Based on Case Fatality Rate of COVID-19 Using Data Envelopment Analysis. International Journal of Business and Social Science Research, [S. l.], v. 3, n. 12, p. 15–22, 2022. DOI: 10.47742/ijbssr.v3n12p3. Disponível em: https://ijbssrnet.com/index.php/ijbssr/article/view/107. Acesso em: 22 jun. 2024.