Efficiency of the Regions Services and its Impact on the Formation of the Gross Regional Product. Global Journal of Management and Business Research, [S. l.], v. 18, n. B6, p. 57–59, 2018. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/2603. Acesso em: 2 sep. 2026.