KHEMAKONGKANONTH, C.; NETNGAMSAWANG, C. . The Competition in Voice Service Market between Network Operators and OTT Service Providers . Journal of Digital Communications, Bangkok, Thailand, v. 7, n. 1, p. 109–127, 2023. Disponível em: https://so04.tci-thaijo.org/index.php/NBTC_Journal/article/view/260756. Acesso em: 21 may. 2024.