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Siregar, Anggi Nurhasanah, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Siregar, Cynthia Crasela, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan, Medan Indonesia (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, Universitas Negeri Medan (Indonesia)
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