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Siregar, Rudi Munzirwan, Universitas Negeri Medan (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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