AKBAR, M. A.; SOOMRO, Y. A.; KHAN, S. Analytical Study of Reducing Brand Switching (Number Portablity) In GSM Sector. JISR management and social sciences & economics, [S. l.], v. 15, n. 2, p. 31–46, 2017. DOI: 10.31384/jisrmsse/2017.15.2.3. Disponível em: https://jisrmsse.szabist.edu.pk/index.php/szabist/article/view/119. Acesso em: 3 may. 2024.