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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)
Sinaga, Cinthia Uly Hotnami, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Sinurat, Dian I, Universitas Negeri Medan (Indonesia)
Sipayung, Murdoni, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
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