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Integration of ATR-FTIR Spectroscopy and Machine Learning for Age Prediction Model of Black Gel Pen Inks . Mal. J. Fund. Appl. Sci. [Internet]. 2026 Apr. 29 [cited 2026 Sep. 5];22(2):382-93. Available from: https://mjfas.utm.my/index.php/mjfas/article/view/4879