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Safril, S., and I. Nur. “Analisis Prototype Pengering Gambir Dengan Memanfaatkan Energi Surya”. Jurnal Teknik Mesin, Vol. 1, no. 1, Mar. 2020, pp. 10-14, http://ejournal2.pnp.ac.id/index.php/jtm/article/view/310.