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Silaban, Ramlan, Department of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan, Medan, Indonesia (Indonesia)
Silaban, Ramlan, Dapertemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Silaban, Ramlan, Universitas Negeri Medan (Indonesia)
Silalahi, Albinus, Chemistry Department Faculty of Mathematics and Natural Science, State University of Medan (Indonesia)
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