Damanik, Marini, Chemistry Department, Faculty of Mathematics and natural Sciences, Universitas Negeri Medan, Medan, 20371, Sumatera Utara (Indonesia)
Damanik, Virni Grace Irene, Chemistry Department, Indonesian University of Education, Bandung, Indonesia (Indonesia)
Daniel, Ivan, Department of Chemistry, State University of Medan (Indonesia)
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)

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