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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)
Sihombing, Junifa Layla, Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan
Sihotang, Reinhard P, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan
Sihotang, Sarah, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
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