On the Practical Assessment of Signal Strength of GSM Network Service Providers. Global Journal of Science Frontier Research, [S. l.], v. 14, n. A1, p. 13–18, 2014. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/100494. Acesso em: 5 feb. 2026.