H. P. Sari, A. Rahayu, D. Cahya Hakika, and S. Pramia Lestari, “Fourier Transform Infrared (FTIR) Characterization of Sulfate Ion Adsorption on One-Pot Synthesized Quaternary Ammonium Polymer Derived from Vinasse Waste ”, Eksergi, vol. 23, no. 1, pp. 39–47, Jan. 2026.