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Simbolon, Ryandi, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan
Simorangkir, Murniaty, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University (Indonesia)
Simorangkir, Murniaty, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Sinaga, April, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sinaga, April, Dapertemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
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