Silitonga, Maria Yovinta, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan
Silitonga, Pasar M, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Silitonga, Pasar Maulin, Universitas Negeri Medan (Indonesia)
Silitonga, Pasar Maulim, Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (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)

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