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Eso, R., Muhammad Abdullah Azam Undu, Sumarno and Muhammad Anas 2020. Efek Variasi Waktu dan Jumlah Lilitan pada Sistem Filter Elektromagnetik Terhadap Penurunan Kadar Pb, Zn dan Co: (Effects of Time Variation and Number of Turns in Electromagnetic Filter Systems on Decreasing Levels of Pb, Zn and Co). Gravitasi. 19, 2 (Dec. 2020), 40-43. DOI:https://doi.org/10.22487/gravitasi.v19i2.15357.