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Siahaan, Ella Oktaviana, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Siahaan, Riris, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Siahaan, Riris Mandaoni, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Siggalingging, Nelsy Theresia, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan (Indonesia)
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