Modelling of Index System of Economic Vitality During the COVID-19 Epidemic. Global Journal of Management and Business Research, [S. l.], v. 21, n. B1, p. 15–37, 2021. Disponível em: https://testing.journalofbusiness.org/index.php/GJMBR/article/view/3333. Acesso em: 4 feb. 2026.