Microwave-intensified esterification of high-free fatty acid feedstock into biodiesel using waste chicken eggshells as a heterogeneous catalyst af Juliati Br Tarigan, Anzelina F. Barus, Nabilah T. Simamora, Ribka S. Tarigan, Sabarmin Perangin-angin, Junedi Ginting, Eko K. Sitepu, Y.H. Taufiq-Yap

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