Chan, Defri, Herman Mawengkang, and Sawaluddin Nasution. “Measurement of DEA-Based ICT Development Efficiency Level With Modified CCR Method”. Jurnal Varian 6, no. 1 (November 23, 2022): 97 - 104. Accessed January 30, 2023. https://journal.universitasbumigora.ac.id/index.php/Varian/article/view/2197.