ZEB, A.; HUSSAIN, K.; AHMAD, U.; AJMAIR, M. Factors affecting the services sector growth in Pakistan: A time varying parametric approach. Journal of Economics Library, [S. l.], v. 4, n. 3, p. 388–395, 2017. Disponível em: https://journals.econsciences.com/index.php/JEL/article/view/1416. Acesso em: 25 jan. 2026.