Silaban, Ramlan, Universitas Negeri Medan (Indonesia)
Silalahi, Albinus, Chemistry Department, Faculty of Mathematics and Sciences, Universitas Negeri Medan
Silalahi, Albinus, Chemistry Department Faculty of Mathematics and Natural Science, State University of Medan (Indonesia)
Silalahi, Albinus, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan
Silalahi, Winda, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)

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