“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, no. 2 (December 31, 2020): 40–43. Accessed September 30, 2026. https://bestjournal.untad.ac.id/index.php/GravitasiFisika/article/view/15357.