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“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, vol. 19, no. 2, pp. 40–43, Dec. 2020, doi: 10.22487/gravitasi.v19i2.15357.