Méndez, A., M. Panduro, G. Romero, D. Covarrubias, and R. Domínguez. “Quality Service Schemes (QOS) for Mobile Cellphones Communication Networks”. CienciaUAT, vol. 1, no. 4, June 2007, pp. 54-57, https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/468.