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., S.; Islami, D. M.; Saputra, Y.; Seprianti, S.; Wahyuni, S.; Ramadhani, F.; Arief, S.; Tetra, O. N.; Putri, Y. E.; Rilda, Y. Natural Zeolits and Its Modifications With Protons and Copper As the Catalyst for Esterification of Ethanol With Acetic Acid. KEG 2019, 4, 296–306.