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81. F.I. Prihadiyono, W.W. Lestari, R. Putra, A.N.L. Aqna, I.S. Cahyani, G.T.M. Kadja. “Heterogeneous Catalyst based on Nickel Modified into Indonesian Natural Zeolite in Green Diesel Production from Crude Palm Oil”. International Journal of Technology, 13,4 (2022).