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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)
Nasution, Hafni Indriati, Universitas Negeri Medan (Indonesia)
Nasution, Hafni Indriati, Chemistry Department, Faculty of Mathematics and natural Sciences, Universitas Negeri Medan, Medan, 20371, Sumatera Utara (Indonesia)
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