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Sirait, Ribka J, Universitas Negeri Medan (Indonesia)
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)
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