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Darmana, Ayi, Billingual Program of Chemistry Depatment, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Darningsih, Ribka, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Daulay, Anny Sartika, Department of Pharmacy, Universitas Muslim Nusantara Al Washliyah (Indonesia)
Daulay, Rabiah Afifah, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
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