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Sirait, Ribka J, Universitas Negeri Medan (Indonesia)
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
Siregar, Rudi Munzirwan, Universitas Negeri Medan (Indonesia)
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