Siregar, Rudi Munzirwan
Siregar, Rudi Munzirwan, Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan 20221, Indonesia (Indonesia)
Siregar, Suci Asda Mutia, Department of Biology, Faculty of Mathematics and Natural Sciences, State University of Medan
Siregar, Vrili Coirala Rama Uli, Billingual Program of Chemistry Depatment, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Sitepu, Ade Prisma, Natural Science Study Program, Biology Department, Faculty of Mathemathics and Natural Science, Universitas Negeri Medan (Indonesia)

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