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Nainggolan, Elsima, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Nainggolan, Sumiati, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Nanda, Aria, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Nandiyanto, Asep Bayu Dani, Chemistry Department, Indonesian University of Education, Bandung, Indonesia (Indonesia)
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