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Sitompul, Nopita, Natural Science Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Sitorus, Catherine S.Lorentz, Department of Chemistry, Faculty Of Mathematic and Natural Sciences, State University Of Medan (Indonesia)
Sitorus, Marham, Jurusan Kimia, FMIPA Universitas Negeri Medan (Indonesia)
Sitorus, Marham, Universitas Negeri Medan (Indonesia)
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