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Sinaga, Cinthia Uly Hotnami, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Sinurat, Dian I, Universitas Negeri Medan (Indonesia)
Sipayung, Murdoni, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sirait, Ribka J, Universitas Negeri Medan (Indonesia)
Sirait, Ribka, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan
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