Budiandri E, Rahadian D, Baltasar S, Sampurnaningsih SR. Digital and Legacy Telecommunications Efficiency in Indonesia: Evidence from a Two-Stage DEA. GIJEA [Internet]. 2026 Apr. 26 [cited 2026 May 13];4(1):72-87. Available from: https://research.e-greenation.org/GIJEA/article/view/786