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Sirait, Ribka, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan
Siregar, Disa R, Universitas Negeri Medan (Indonesia)
Siregar, Kurnia Rizki, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan (Indonesia)
Siregar, Rudi Munzirwan, Universitas Negeri Medan (Indonesia)
Siregar, Rudi Munzirwan, Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem
Iskandar Pasar V Medan Estate, Medan 20221, Indonesia (Indonesia)
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