Hidayat, N.; Krisnawati, V. H.; Abusini, S.; Khairi, D. R. SMARTPHONE PURCHASING DECISION MAKING USING AN INTERVAL-VALUED INTUITIONISTIC FUZZY AHP APPROACH: A CASE STUDY IN MALANG CITY. BAREKENG: J. Math. & App. 2026, 20, 1731–1742.