SUTHERLAND, Ewan. International Mobile Roaming: Progress and Challenges in African Markets. The African Journal of Information and Communication (AJIC), South Africa, n. 11, 2011. DOI: 10.23962/10539/19718. Disponível em: https://ajic.wits.ac.za/article/view/13704. Acesso em: 26 apr. 2024.