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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)
Siburian, Lisna Sevta, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sidabutar, Efimah, Departmen of Biology, Faculty of Mathematics and Science, Universitas Negeri Medan (Indonesia)
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