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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, Marham, Universitas Negeri Medan (Indonesia)
Sitorus, Marham, Jurusan Kimia, FMIPA Universitas Negeri Medan (Indonesia)
Sitorus, Yonas Alexandry, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (Indonesia)
Sofiyanita, Sofiyanita, Universitas Islam Negeri Sultan Syarif Kasim Riau Pekanbaru (Indonesia)
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