Quintero, O. Lucía, Fabián L. Jaramillo P, and Manuela Bastidas. “Modeling Perspective for the Relevant Market of Voice Services: Mobile to Mobile”. Maskana 6, no. 2 (December 15, 2015): 187–201. Accessed May 4, 2024. https://publicaciones.ucuenca.edu.ec/ojs/index.php/maskana/article/view/497.