Canigia, B. et al. 2014. ANALISIS ATRIBUT-ATRIBUT DAN POSISI OPERATOR GSM (GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS) BERDASARKAN PREFERENSI PELANGGAN. Jurnal Matematika UNAND. 3, 4 (Dec. 2014), 78–85. DOI:https://doi.org/10.25077/jmu.3.4.78-85.2014.