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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, 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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