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Pulungan, Ahmad Nasir, Departemen of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Pulungan, Ahmad Nasir, Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan
Pulungan, Akhir Mauludin, Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan
Purba, Caecilia Antonia, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan, Medan Indonesia (Indonesia)
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