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Silitonga, Pasar Maulin, Universitas Negeri Medan (Indonesia)
Silitonga, Pasar M, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Silitonga, Yosi Santika, Billingual Program of Chemistry Depatment, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Simanjuntak, Debora P, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Simanjuntak, Maria Enjelita, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (Indonesia)
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