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Hutahuruk, Andreta B, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan (Indonesia)
Hutasoit, Robeka, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (Indonesia)
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Inayah, Niswatul, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (Indonesia)
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